1) Which of the following statement is not true both for B and Al?
2) In which of the following elements + 1 oxidation state is more stable than +3 ?
3) Which of the following is used in high temperature thermometry?
4) Which of the following element is present most abundant in the earth's crust?
5) Which of the following is a Lewis acid?
6) Boron compound behave as Lewis acid because of their
7) The purification method of bauxite containing iron oxide as impurity is known as
8) Which of the following imparts green color to the burner flame ?
9) What is molecular formula of Borazole ?
10) Thermite is a mixture of iron oxide and
11) Which of the following is not a protonic acid ?
12) The pair of amphoteric hydroxide is
13) Which of the following is not correct with regard to the structure of diborane ?
14) Which of the following mineral does not contain Al ?
15) Which is true for an element R present in group 13 of the period table ?
16) Which is the most amphoteric ?
17) Which of the following statement is not true about potash alum?
18) Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because
19) Corundum is
20) Purification of aluminium by electroytic refining is known as
21) Which one of the following is used to remove silicon dioxide in the Serpeck's process of purification of bauxite ?
22) Corundum is an ore of
23) In Hall's process, the main reagent is mixed with
24) When bauxite powder is mixed with coke and reacted with nitrogen at 2075 k, carbon monooxide and X are formed. What is the gas formed. What is the gas formed when X is reacted with water?
25) The chief ore of Al is
26) Which one of the following has the lowest m.pt.?
27) Alum is not used
28) Which of the following statement is incorrect ?
29) Aluminium(III) chloride forms a dimer because
30) Which out of the following is potash alum?
31) Which of the following is not a Lewis acid ?
32) The aqueous solution of potash alum is
33) Aluminium reacts with concentrated HCl and Concentrated NaOH to liberated the gases...................respectively
34) A layer of coke is spread over bauxite during extraction of aluminium. This acts as a/an
35) Which one of the following element is non-metal?
36) In diborane the two H-B-H angles are nearly
37) Which metal is protected by a layer of its own oxide?
38) Aluminium becomes passive in
39) Action of caustic soda with soda on aluminium hydroxide gives a compound having formula
40) Aluminium reacts with caustic soda to form
41) 'Thermite ' is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X and Y respectively are
42) Which of the following is the electron deficient molecule ?
43) Which one is metaboric acid ?
44) Which of the following does not give a borax bead test?
45) In a molecule of diborane
46) Which of the following ions does not exist in an aqueous solution?
47) Among the following, which show the correct order of magnitude of inert-pair effect ?
48) Orthoboric acid contains
49) Which of the following statement is incorrect?
50) on hydrolysis, diborane produce
51) By which of the given reaction boeazine prepared?
52) Which of the following statement is incorrect ?
53) Which of the following statement is incorrect
54) The reducing power of Al, Ga, In and Tl are in the same order
55) Aluminium chloride ionizes in an aqueous solution because
56) Which of the following metal does not show an inert - pair effect?
57) Molecular weight of anhydrous aluminium chloride is
58) Borax on heating with cobalt oxide forms a blue bead of
59) All alum contains
60) Which of the following structure correctly represents the boron trifluoride molecule ?
61) The borax bead is chemically
62) By which of the following reaction is borazine prepared ?
63) Chemically borax is
64) Which of the following structure does not represent the compound given in parenthese ?
65) Aluminium deposition as vapour on glass form a good mirror, essentially because
66) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain
67) Boric acid is prepared from borax by the action of
68) Anodised aluminium is
69) Boric acid is not used as
70) Alane is chemically
71) Reactivity of borazole is greater than that of benzene because
72) Mineral of aluminium that does not contain oxygen is
73) Which one of following elements has the highest melting point ?
74) The element which show least metallic character is
75) Which member of group 13 does not exhibit the group valency in its compounds ?
76) Group 13 element shows
77) Which of the following statement is incorrect ?
78) The melting point of group 13 follows the order
79) Which of the metal chlorides has maximum covalent character ?
80) Among the halides of the element of group 13 the one which is most acidic is
81) Which one of the following oxides is strongly basic ?
82) The amphoteric oxide from among the following is
83) The power of halides of boron to act as Lewis acids decrease in the order
84) Pick up the wrong statement
85) Which of the following hydroxide is acidic ?
86) In borax bead test the coloured ions give characteristic colored beads due to formation of
87) Which of the following is not isomorphous with true alum and is called pseudoalum ?
88) Which of the following property does not support anomalous behaviour of boron?
89) Two elements X and Y react separately with highly electropositive metal to form binary compounds, which upon hydrolysis yield mixture of boranes and silanes X and Y separately are
90) Boric acid is polymeric due to
91) Which of the following s not Lewis acid ?
92) Which of the following statement is correct ?
93) The type of hydridization of boron in diborane is
94) The type of hydridization of boron in diborane is
95) The hardest compound of boron is
96) Which of the following is a gas ?
97) Inorganic benzene is
98) Which is used as disinfectant?
99) Which of the following does not have a tetrahedral structure ?
100) Which of the following statement is false ?
101) Borax is not used
102) Aluminothermy used for on the spot welding of large iron structure is based upon the fact that
103) The chemical formula of bauxite is
104) Inert pair effect plays an important role in case of
105) Which of the following is correct statement?
106) A particular element belong to group 13 and second period of the periodic table, it is
107) In the Hoope's process for refining of Al the fused materials form three different layers and they remain separated during electrolysis also. This is because
108) In the electrolytic extraction of aluminium fused cryolite is added
109) The chemical composition of cryolite mineral
110) Which of the following process does not involve a catalyst ?
111) Aluminium vessels should not be washed with materials containing washing soda since
112) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because
113) Which is not a mineral of aluminium ?
114) Aluminum chloride is a / an
115) Aluminium oxide is not reduced by chemical reactions since
116) Alum is a water purifier because it
117) An example of alum is
118) Aluminium helps in purifying water by
119) Aluminium is extracted by the electrolysis of
120) Heating an aqueous solution of aluminium chloride to dryness will give
121) ON the addition of mineral acid to an aqueous solution of borax, the following compound is formed
122) Alum is used by dyers of clothes
123) In the aluminothermite process, Al acts as a/an
124) Hydrogen will not reduce
125) In the electrolysis of aluminium, cryolite is added to
126) Alumina is
127) Which is electrophile ?
128) Moissan Boron is
129) Aluminium reacts with caustic soda to form
130) The chief impurity present in red bauxite is
131) Which is strong Lewis acid ?
132) Borax is prepared by treating colemanite with
133) Heating an aqueous solution of aluminium chloride to dryness will give
134) Galena is an ore of
135) The halide which is not hydrolysed is
136) Which of the following statements is correct with respect to the property of element with increase in atomic number in the carbon family (group 14)?
137) Which of the following bonds has the most polar character ?
138) Which of the following is most dense ?
139) The oxide which cannot act as reducing agent is
140) A pseudo solid is
141) Silicon is an important constituent of
142) Cassiterite is an ore of
143) Quartz is crystalline variety of
144) Mark the oxide which is amphoteric in character
145) Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon
146) The element that does not form a monoxide is
147) Butter of tin is
148) Which of the following is most stable ?
149) Thomas slag is
150) Which of the following has no tin in its composition ?
151) Which of the following halides is the most stable ?
152) C and Si have
153) Silica is soluble in
154) Carborundum is
155) The percentage of lead in lead pencil is
156) Which of the following sulphate is insoluble in water
157) The metal used for making radiation shield is
158) The substance used as a smoke screen in warfare is
159) The sequence of acidic character is
160) Composition of glass is
161) Which of the following show bonds in silicones ?
162) Red lead is
163) In the manufacture of cement which of the following is used ?
164) Glass reacts with HF to produce
165) In laboratory, silicon can be prepared by the reaction of
166) Which does not exist ?
167) Which of the following is most electronegative ?
168) Important ore of lead is
169) The most stable +2 oxidation state is exhibited by
170) Water is an important fuel. It is a mixture of
171) When a mixture of air and steam is passed over red hot coke, the out going gas is
172) Carbon atoms in diamond are bonded with each other in configuration
173) Which one of the following characteristic property of carbon ?
174) Diamond is an example of
175) Water gas is produced by
176) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of
177) Which of the following has the highest calorific value ?
178) Which of the following types of forces bind together the carbon atoms in diamond ?
179) Carbogen is
180) In graphite, electrons are
181) Higher percentage of carbon is found in
182) Diamond and Emerald are formed of
183) The green house effect is caused by
184) Which one of the following allotropic forms of carbon isomorphous with crystalline silicon ?
185) In graphite, the sheets are held by
186) Graphite is
187) Pyrosilicate ion is
188) The variety of glass used in making lenses and prisms is
189) An alloy of Pb and Sn in equal proportion is called
190) Graphite is similar to
191) A fibrous mineral which can withstand red hot flames without any damage is
192) The stability of the tetrahalides of carbon decrease in the order
193) Which of the following is most ionic ?
194) Which of the following metal carbides may be called a methanide?
195) Carbon -60 contains
196) Which of the following statement is correct ?
197) In carbon monoxide molecule, carbon and oxygen are linked by
198) Which of the following statement is incorrect ?
199) In carbon -60 all carbon atoms are
200) Which of the following compounds is used as an abrasive ?
201) Which of the following is industrial fuel ?
202) Which of the following oxides of carbon is unstable ?
203) Chemically zeolites are
204) lead sugar is
205) Carbon dioxide is gas but silica is a solid because
206) Which of the following show bond in silicone
207) Which element does not exhibit allotropy ?
208) Semi water gas is a mixture of
209) Wood charcoal is used in gas masks because it
210) Aqueous solution of sodium silicate is
211) Which gas is essential constituent of almost all fuel gases ?
212) Which gas present in atmosphere darkens the surface painted by white lead ?
213) Bell metal is an alloy of
214) Tin plague is the
215) Which is the least pure form of carbon ?
216) The component present in greater proportion in water gas is
217) tin cry refers to
218) Plumbo-solvency means dissolution of lead in
219) A reducing agent is
220) Which oxide has three dimensional structure
221) Purest form of silica is
222) Which gas has more percentage in coal gas?
223) Least stable hydride is
224) Which is not a allotrope of carbon ?
225) Which has peroxide linkage ?
226) Which is not the property of diamond ?
227) Minium is
228) Which is not correct?
229) Litharage is not commonly
230) Which one of these is acidic ?
231) Carbon forms a large no. of compound because it has
232) Ge(II) compounds are powerful reducing agent whereas Pb(IV) compounds are strong oxidants .This can be due to
233) The composition of the common glass is
234) The shape of carbon dioxide molecule is
235) Which of the following combines with haemoglobin of the blood to form caboxyhaemoglobin?
236) Which of the following is amphoteric ?
237) Which of the following has maximum bond dissociation energy ?
238) A gas which burns with blue flame is
239) Which of the following gases causes pollution when present in the exhaust fumes of vehicles ?
240) Natural gas is
241) Lead sulphate is soluble in
242) Which of the following lead oxides is 'Sindhur'?
243) Atomic orbitals of carbon involved in diamond structure are
244) Wood charcoal is used to decolourise sugar because it
245) In graphite, C atom is in ..................state
246) An oxide of lead which is used in lead storage batteries , in safety matches and is powerful oxidizing agent is
247) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
248) Glass is a
249) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards of the tin buttons of their uniforms. White metallic tin button got converted to grey powder. This transformation is related to
250) In silicon dioxide
251) The stability of dihalides of Si, Ge, Sn and Pb increase steadily in the sequence
252) Carborundum is obtained when silica is heated at high temperature with
253) Moderate electrical conductivity is shown by
254) The electronegativity of the following elements increase in the order
255) The species that does not contain peroxide ions is
256) Material used in solar cell contain
257) Which of the following halides is least stable and has double existence ?
258) Which of the following oxides is neutral ?
259) White lead is
260) The composition of the common glass is
261) In laboratory burners, we use
262) Which of the following oxide is amphoteric in character ?
263) In silicon dioxide
264) A metal M forms chlorides in +2 and +4 oxidation states Which of the following about these chlorides is correct ?
265) Statement 1 : White phosphorus is stored under water. Statement 2 : White phosphorus is highly reactive and catches fire spontaneously in air.
266) Statement 1 : Boranes are volatile and decompose to boron, and hydrogen at red heat. Statement 2 : All the boranes react with ammonia depending on the conditions.
267) Statement 1 : Among chalcogens, tendency of catenation is maximum for sulphur. Statement 2 : S-S bond dissociation energy is higher then O-O bond dissociation energy.
268) Statement 1 : Si-Si bonds are weaker than Si-O bonds. Statement 2 : Silicon forms double bonds with itself.
269) Statement 1 : The ionization energy of gallium remains nearly same as that of aluminium. Statement 2 : This is due to shielding of outer shell electrons form the nucleus by the d electrons of gallium.
270) Boron nitride on reacting with caustic alkali gives:
271) The different layers in graphite are held together by
272) Colemanite is a mineral of:
273) Which of the following is a mixed oxide?
274) In the sale of diamonds the unit of weight is carat. One carat is equal to:
275) Which gas present in atmosphere darkens the surface painted by white lead?
276) Which of the following is most abundant in the earth crust?
277) Which form of carbon has a two-dimensional sheet-like structure?
278) Extraction of metal from the ore cassiterite involves
279) An alumina-silica clay, called bentonite is dropped from aeroplanes in the slurry form for:
280) Gun shots are made of lead with a little arsenic. The function of As is to increase:
281) The glass having smallest coefficient of thermal expansion is :
282) Carborundum is obtained when silica is heated at high temperature with
283) Tin plague is the:
284) Water glass is:
285) If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by:
286) Which property is common in diamond and graphite?
287) In which of the following the inert pair effect is most prominent?
288) Which oxide has three dimensional structure?
289) Diamond and graphite are:
290) Minium is:
291) Which of the following is called alum?
292) The carbon of microphones used in public address systems is :
293) Aluminium is extracted by the electrolysis of
294) In Gold Schmidt reaction, certain metallic oxides are reduced to the metallic state by-heating with:
295) Formula for agate is
296) Pure CO can be obtained from:
297) Which is used for the manufacture of optical instruments?
298) Which element has a limited coordination number of four?
299) In Goldschmidt aluminothermic process, thermite contains
300) During the electrolysis of cryolite, aluminium and fluorine are formed in molar ratio
301) Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide?
302) Which gas is used in airated water?
303) Which is not an ore of lead?
304) Borax on heating with cobalt oxide forms a blue bead of:
305) Inorganic benzene is:
306) The correct formula of borax is:
307) The formula of mineral borax is
308) The hardest compound of boron is:
309) For purification of alumina, the modern processes most useful when (i) the impurity present is a lot iron oxides and (ii) the impurity present is a lot of silica, are
310) Tin, a silvery white metal exists in:
311) Which of the following oxide is amphoteric?
312) Which of the following does not have a tetrahedral structure?
313) Which of the following oxides is strongly basic?
314) Aluminium metal is corroded in coastal places near to the sea, because protective oxide film:
315) The most abundant metal in the earth crust
316) Which mixed sulphate is not an alum?
317) In the aluminothermic process, Al acts as a/an
318) Which is used as control rods in nuclear reactors?
319) Potash alum is water soluble and ionises in aqueous solution to give:
320) Lead sugar is:
321) Which does not exist?
322) Which form of carbon is used in making boot polish, printing ink, paint and black varnish?
323) Which of the following shows bond in silicone?
324) Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone?
325) Tin sulphide is:
326) Lead pipes are not suitable for drinking water because
327) Aluminium forms:
328) Which oxidation states are the most characteristics of lead and tin respectively?
329) The alloy used in preparation of balance beam:
330) The substance used to impart green colour to glass is:
331) Which metal powder if spread in air, becomes hazardous?
332) Crystalline silicon was obtained by:
333) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because:
334) Silicon hydrides are named as:
335) Which compound can make fire proof clothes?
336) A kettle which becomes furred-up in use has inside it a deposit composed mainly of:
337) Aluminium is obtained by
338) Which of the following is not correct in case of boron nitride?
339) Zn on heating with barium carbonate gives :
340) Hybridisation of boron in diborane is:
341) When tin is treated with concentrated nitric acid
342) The ability of a substance to assume two or more crystalline structures is called:
343) Glass is soluble in:
344) Duralumin is an alloy of:
345) Among the following the purest form of carbon is :
346) Which of the following anion is present in chain structure of silicate?
347) Tin reacts with:
348) Which gas is responsible for green house effect?
349) Al and Ga have the same covalent radii because of:
350) Magnalium contains
351) Crystalline form of silica is called
352) Borax is prepared by treating colemanite with:
353) Which is not the property of diamond?
354) What happens when steam is passed over red hot carbon?
355) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
356) Purest form of silica is :
357) Alzeimer's disease is caused due to Al interaction with internal organs of the body if food is contaminated with Al. This disease
358) Metalloid among the following is:
359) Alumina may be converted into anhydrous aluminium chloride by:
360) The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
361) PbO is
362) Among the following the maximum covalent character is shown by the compound:
363) Asbestos is chemically:
364) The structure of diborane contains:
365) Borax is:
366) Heating an aqueous solution of aluminium chloride to dryness will give
367) Hoope's process is used for the purification of the metal
368) Which of the following is the electron deficient molecule?
369) A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be :
370) Which compound is solid?
371) The first I.P. of Al is smaller than that of Mg because:
372) Which type of forces bind together the carbon atoms in diamond?
373) Ordinary glass is:
374) The common semiconductor is:
375) Alumina is
376) Plumbo-solvency means dissolution of lead in:
377) Which of the following does not exist in free form?
378) On doping Ge metal with a little of ln, one gets:
379) Vapour density of which gas is near to air?
380) Muddy water can be purified through coagulation by using
381) Carbon monoxide on heating with sulphur gives:
382) In electrolysis of aluminium oxide which of the following is added to accelerate the process
383) The most abundant gas in ordinary air among the following is:
384) Silicon is usually found in:
385) Corundum is:
386) Synthetic gas is a mixture of:
387) Lead pipes can be used for:
388) The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of:
389) Aluminium is not present in which of the following mineral?
390) The correct order of decreasing ionic nature of lead dihalides is :
391) Diborane does not undergo cleavage reaction with:
392) The correct Lewis acid order for boron halides is:
393) Formula of felspar is
394) Stannous oxide can be obtained by:
395) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of :
396) The fraction by volume of carbon monoxide in producer gas is about:
397) Alum is not used:
398) The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27)
399) Carbon dioxide dissolves under pressure in water to give:
400) Which fuel has the highest calorific value?
401) Which of the following is not correct?
402) The chemical formula of sindhur is
403) Aluminium oxide is not reduced by chemical reactions since
404) When sand is heated with hydrofluoric acid and a wet rod is brought in contact with vapours evolving a white deposit is due to
405) Aluminium reacts with caustic soda to form
406) Which is not a characteristic property of carbon?
407) Which of the following is more stable?
408) The relative Lewis acid character of boron trihalides is in the order
409) In diborane the two H-B-H angles are nearly
410) Thermite is a mixture of
411) Alum is added to muddy water because
412) White lead or basic lead carbonate is:
413) Among the various allotropes of carbon :
414) Oxides of silicon are:
415) The reducing agent in thermite process is
416) Man dies in an atmosphere of carbon monoxide, because it:
417) Which metal is protected by a layer of its own oxide?
418) Which has highest b.p.?
419) There are two H-bridge bonds in diborane molecule because there are:
420) Which of the following oxides is amphoteric in character?
421) Water gas is produced by:
422) CO forms a volatile compound with:
423) Red lead is
424) Which one of the following statements about the zeolite is false?
425) The order of acidic strength of boron trihalides
426) Alane is chemically:
427) Heating an aqueous solution of aluminium chloride to dryness will give:
428) Buckminster fullerene is
429) Lead (IV) oxide is obtained by :
430) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite
431) The composition of the common glass is
432) Aluminium becomes passive in nitric acid because it:
433) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is
434) An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to
435) Which of the following form dimeric halides?
436) Aluminium appears like gold when it is mixed with:
437) The C—X bond energy order for carbon tetra halides is:
438) An example of a major air pollutant is:
439) Which of the following is used in making printer's ink, shoe polish, black varnish and paint?
440) Pewter is an alloy of :
441) Nickeloy is an alloy containing:
442) Rose metal is an alloy of:
443) The hottest part of the Bunsen burner flame is:
444) An insulator is:
445) By chlorinating carbon disulphide with chlorine in presence of aluminium chloride, we get:
446) The element which forms neutral as well as acidic oxides is:
447) In the alumino-thermic process, aluminium acts as:
448) Carborundum is the commercial name of :
449) Which is amphoteric compound?
450) Diborane reacts with water to form:
451) Pyrex glass is a mixture of :
452) The chief impurity present in red bauxite is
453) Amorphous boron on burning in air forms:
454) Be and Al exhibits many properties which are similar but the two elements differ is:
455) What is the state of hybridization of carbon in fullerene?
456) Boron was isolated by:
457) Borax bead test is responded by:
458) Which of the following gives propyne on hydrolysis?
459) A fibrous mineral which can withstand red hot flames without any damage is
460) Which has highest bond energy?
461) Lead may be replaced from its salt solution by:
462) Which is not correct?
463) On the addition of mineral acid to an aqueous solution of borax, the compound formed is:
464) An aqueous solution of potash alum gives
465) Unstable lead compounds are
466) Which is neutral to litmus?
467) Bell metal is an alloy of :
468) Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:
469) Coke is obtained from coal by:
470) The liquid field metal expanding on solidification is
471) Graphite is used in nuclear reactors:
472) Carbon tetrachloride has zero dipole moment because of:
473) Massicot is prepared by:
474) Animal charcoal is used for decolourisation of sugar because:
475) Pyrosilicate ion is:
476) Which is used as disinfectant?
477) What is the number of free electrons present on each carbon atom in graphite?
478) Diaspora is:
479) Which of the following reactions occurs at the cathode during the charging of lead accumulator?
480) The coal form containing maximum percentage of carbon is:
481) Water softner is
482) The main constituents of coal gas are:
483) Carbon dioxide is a gas but silica is a solid because :
484) Alums are used for
485) Lead pipes are corroded quickly by
486) Melting point is highest for:
487) Purification of alumina is essential because:
488) Which one shows most pronounced inert pair effect?
489) Producer gas, a fuel and also a source of nitrogen is obtained by:
490) Which of the following is an ore of lead?
491) White lead is
492) Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. While metallic tin buttons got converted to grey powder. This transformation is related to
493) Anodised aluminium is:
494) The variety of glass, used for the preservation of eggs is:
495) Solder is an alloy of lead with
496) Which of the following is used for making optical instruments?
497) Tincal is
498) Tin (II) fluoride (anhydrous) can be obtained by :
499) Producer gas is a mixture of:
500) Which statement is false?
501) Which of the following is the correct statement for red lead?
502) The formula of potash alum is
503) In diborane the two H-B-H angles are nearly
504) Potash alum dissolves in water to give a/an
505) Which is the least pure form of carbon?
506) The calorific value of carbon is about ……. kcal.
507) Aluminium metal is refined by
508) Which one of the following metals work as a reduction in smelting process?
509) Which of the following has structure similar to graphite?
510) Tin (II) chloride (anhydrous) can be obtained:
511) An element A dissolves both in acid and alkali. It is an example of
512) Which statement is not true about potash alum?
513) Which melts in boiling water?
514) Solder is an alloy of :
515) Hardest element of III A group of gp.13 is:
516) Tin cry refers to:
517) The composition of the common glass is
518) The method of zone refining of metals is based on the principle of
519) Feldspar is:
520) The thermal stability order for group 14 halides is:
521) Tungsten carbides is an example of:
522) The hybridization of boron atom in orthoboric acid is:
523) Which of the following is known as inorganic benzene?
524) Which is not an allotrope of carbon?
525) Carbogen is:
526) Mica is chemically:
527) The compound used in lead accumulators is:
528) When tin is treated with concentrated nitric acid
529) Which of the following is pseudoalum?
530) Which element does not exhibit allotropy?
531) One that marks the paper like lead is:
532) Carbon monoxide will not reduce:
533) Graphite is made by heating coke with silica for many hours in a :
534) Which of the following undergoes sublimation?
535) Which is used as mordant?
536) Molecular weight of anhydrous aluminium chloride is:
537) The elements of IV A group or group 14 have 4 electrons in their outermost orbit. They:
538) In purification of bauxite by hall's process
539) Newton's alloy contains :
540) Boron readily dissolves in:
541) Which of the following is not a Lewis acid?
542) The protective film of oxide on the surface of Al metal may be strengthened by:
543) Sapphire is a mineral of:
544) Which is/are fire extinguishers?
545) The borax bead is chemically:
546) Which of the following is only acidic in nature?
547) Which poisonous gas is present in the exhaust of car?
548) A metallic oxide which imparts purple colour to pottery is:
549) Inorganic benzene is
550) The cryolite is:
551) Quartz is made of silicon and oxygen joined in a network arrangement that is similar to :
552) Eka aluminium is:
553) Boric acid is prepared from borax by the action of:
554) The acid used for etching the glass is:
555) The greatest percentage of CO is in:
556) The process used for purification of bauxite are containing iron oxide impurity is known as:
557) Which of the following does not contain silicon?
558) Which statement is correct?
559) Which one of the following statements about the zeolites is false?
560) Least stable hydride is :
561) Which is true for an element R present in III group of the periodic table?
562) Which is correct oxidation state of lead?
563) In III A group, Tl (thalium,) shows +1 oxidation state while other members show +3 oxidation state, why?
564) Which of the following is a three dimensional silicate?
565) Hydrogen forms a bridge in the chemical structure of:
566) Boron differs from the other members of group 13 because it:
567) Which of the following is a use of alum?
568) Which fuel has the highest calorific value (kJ/kg)?
569) Which of the following is a gas?
570) Lead sulphate is soluble in :
571) Colour is imparted to glass by mixing:
572) Dry ice is
573) Mineral of aluminium that does not contain oxygen is:
574) Which one of the following ores is best concentrated by froth-floatation method?
575) Which metal is powdered, suspended in oil and used as paint?
576) Aqueous solution of potash alum is:
577) In alumino thermic process, Al is used as
578) The composition of mica is:
579) Coal gas:
580) Lead chromate is……..in colour.
581) Which halide is least stable and has doubtful existence?
582) Litharge is not commonly used in :
583) The precious Ruby stone is:
584) Wood charcoal is used in gas masks because it:
585) On strong heating lead nitrate gives:
586) Which is not correct?
587) All alums contain:
588) Moderate electrical conductivity is shown by
589) The molecules of aluminium chloride in vapour state:
590) Semi water gas is mixture of :
591) Borax bead test is not given by:
592) The correct order of increasing atomic radii, is
593) Boric acid is not used:
594) Identify the statement that is not correct as far as structure of diborane is concerned
595) Which of the following is amphoteric?
596) Which of the following is not an ionic trihalide?
597) Which of the following processes does not involve a catalyst?
598) The metal which does not form a polynuclear carbonyl is :
599) Tetra ethyl lead is used as:
600) Which of the following statement is correct with respect to the property of elements in the carbon family with an increase in the atomic number? Their
601) The chemical formula of phosgene or carbonyl chloride is:
602) Which is not a mineral of aluminium?
603) Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite.
604) The stability of hydrides of carbon family is in the order
605) Which does not react with water?
606) The number of electrons present in the valency shell of group 13:
607) Moissan boron is
608) The metallic character of the elements of IV A group or group 14 :
609) Which of the boron compound is optically active?
610) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain:
611) Foramtion of in-numberable compounds of carbon is due to its
612) Flux is used to
613) Moissan boron is
614) Electrolytic reduction of pure alumina is not possible because:
615) Boric acid is used in carom boards for smooth gliding of pawns because
616) Iodine is decolourised by:
617) Quartz is an example of
618) Which can be directly brought into solid state from gaseous state?
619) In aluminates coordination number of Al is:
620) Thallium shows different oxidation sates because:
621) Al reduces most of the metallic oxides due to its greater affinity for:
622) Water as is
623) Which one is explosive?
624) The inert form of carbon is:
625) Annealing of glass is done to:
626) Calorific value of producer gas is low because of
627) Mark the correct statement:
628) Producer gas is the mixture of
629) In laboratory silicon can be prepared by the reaction
630) Which of the following shows variable valency?
631) Elements of group 13 form oxides of the general formula:
632) Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family?
633) Alumina on heating with carbon in nitrogen atmosphere gives:
634) Which of the following has the minimum heat of dissociation?
635) Carbon reacts with strong electropositive metal oxides to form:
636) Carbon is soluble in:
637) Tetrahalides of IV A group of group 14 elements are:
638) The percentage of carbon is least in :
639) The most reactive form of carbon is:
640) Which is not used as pigment in paints?
641) Water glass is
642) Aluminium does not react with:
643) Tendency of catenation is strongest in:
644) Carborundum is
645) Which is not an alloy of aluminium?
646) Purification of alumina takes place by
647) Thallium shows different oxidation states because:
648) Thermite a mixture used for welding is:
649) Borax bead test depends on the formation of:
650) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to
651) The basic structural unit is silicates is
652) Good conductor of heat and current is:
653) Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain:
654) Ammonical CuCl absorbs:
655) The refractive index of diamond is highest among solids. Its value is:
656) The correct statement with respect to carbon monoxide is:
657) Which element of group 14 forms only one hydride?
658) Highest electronegativity among the following is for:
659) The stability of + 1 oxidation state increases in the sequence:
660) Ultra violet rays are not allowed to pass through:
661) Metal protected by a layer of its own oxide is:
662) The colour of copper metaborate and chromium metaborates are respectively:
663) Which gas is essential constituent of almost all fuel gases?
664) The precious stone aquamarine is:
665) Which metal is an important component of transistors?
666) When Al is added to potassium hydroxide solution:
667) An acid among the following is:
668) CO reacts with chlorine in presence of sunlight to gives:
669) Which is used in high temperature thermometry?
670) Silicon is
671) Which ore is best concentrated by froth floatation process?
672) Buckminster-fullerene is a variety of
673) CO is poisonous gas, antidote for CO poisoning is
674) Commercially important ore of lead is:
675) Difference between diamond and graphite is due to:
676) Which element is used for making a transistor?
677) Which one of the following compounds, is not a protonic acid?
678) Aluminium reacts with nitrogen to form:
679) Al-Bronze contains Al and:
680) Silica is a/an
681) Which one of the following is used as an acid flux in metallurgy?
682) Which one of the following is the correct statement?
683) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
684) Which of the following is a mixed oxide?
685) Which metal burn in air at high temperature with the evolution of much heat?
686) Boron when heated with carbon forms
687) Which is a true acid anhydride?
688) Roasted tin stone ore after washing with water is known as
689) Activation of charcoal:
690) Compound of lead used in match industry is:
691) Which gas has more percentage in coal gas?
692) A particular elements belongs to group 13 and II period of the periodic table. It is:
693) In graphite, the sheets are held by :
694) Stable compounds in +1 oxidation state are formed by:
695) Which of the following is a good conductor of heat and electricity?
696) Which element occurs in free state?
697) C and Si belong to IV group or group 14. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to :
698) Pyrene (a fire extinguisher) is:
699) Which does not exist?
700) The reducing power of divalent species decreases in the order :
701) The hardest substance amongst the following
702) The hybridization of carbon in carbon monoxide is:
703) Newly shaped glass articles when cooled suddenly become brittle, therefore these are cooled slowly, this process is known as:
704) Aluminium carbide reacts with dil. HCl to give:
705) The blue coloured mineral 'Lapis Lazuli' used as semiprecious stone is:
706) The correct order of decreasing hardness of the following compounds is:
707) It is impossible to fuse strips of copper, silver or iron into soda glass because of a difference in the properties of glass and the metal. The property concerned is:
708) The catalyst used in Friedel-Craft's reaction is:
709) The metal used in acid storage batteries is:
710) In Hall's process, the ore is mixed with:
711) Sesquioxide of lead is:
712) Tin (IV) chloride (anhydrous) can be obtained:
713) What product is formed on heating lead nitrate?
714) Which of the following imparts green colour to flame:
715) Destructive distillation of coal does not gives:
716) Red lead is an example of
717) Cassiterite is an ore of
718) Hoope's process is used in the refining of:
719) Boron compounds behave as Lewis acid because of their:
720) Which is pseudo solid?
721) The number of carbon compounds is very large because it:
722) Which species does not exist?
723) Boron halides behave as Lewis acids because of their ……… nature.
724) Silicones have the general formula
725) Water gas cannot be prepared by a continuous process because:
726) Glass reacts with HF to produce
727) Which glass has the highest percentage of lead?
728) Diamond and graphite both are made of carbon atoms. Diamond is extremely hard whereas graphite is soft. This is because :
729) ……is the byproduct obtained in the Serpeck's process.
730) An ionic compound is:
731) Which one of the following is correct statement?
732) Density is highest for :
733) If the flame of a gas stove burns with yellow tips, the burner must be adjusted to provide:
734) Purification of Al by electrolysis method is called
735) Which element shows more pronounced inert pair effect?
736) Teflon is:
737) The tendency for catenation in Group 14 elements varies in the order
738) Coordination number of aluminium is
739) The approximate composition of soda glass is:
740) Lead pipes are readily corroded by :
741) Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of
742) Lapis lazuli is
743) Bone black is an allotrope of :
744) The use of diamond as a gem depends on its:
745) PbO is ……..oxide.
746) Aqueous solution of sodium silicate is:
747) Boron cannot form which one of the following anions?
748) During day time plants absorb:
749) Bucky ball or buck minster fullerene is:
750) Diamond is hard because
751) The process used for purification of bauxite ore containing high silica content as impurity is:
752) Aluminium is mainly extracted from:
753) A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?
754) Which is not a crystalline form of silica?
755) Which is likely to show inert-pair effect?
756) A potter wishes to make a deep blue glaze. Which one of these available chemicals should be mixed?
757) The bonds present in borazole are:
