Practice Test


1) If an isotope of hydrogen has two neutrons in its atom, its atomic number and mass number will respectively be


2) Calgon used as water softener is


3) What is heavy water ?


4) The alum used for purifying water is


5) What is formed when calcium carbide reacts with heavy water?


6) The reagent commonly used to determine hardness of water titrimetrically is


7) Which one of the following statements about the zeolites is false ?


8) Which of the properties of interstitial hydrides is correct ?


9) Which one of the following reaction does not form gaseous product ?


10) Hydrogen directly combines with


11) Which is the lightest gas?


12) Hydrogen behaves as an oxidising agent in its reaction with


13) The composition of tritium is


14) Hydrogen accepts an electron to form inert gas configuration. in this it resembles


15) The process used for the removal of hardness of water is


16) Action of water or dilute mineral acids on metals can give


17) When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volume of hydrogen evolved is


18) One would expect proton to have very large


19) The absorption of hydrogen by palladium is called


20) When two ice cubes are pressed over each other,they form one cube. Which of the following forces is responsible to hold them together?


21) Pure water can be obtained from sea water by


22) By which of the following process permanent hardness of water can be removed ?


23) Which of the following is correct for hydrogen ?


24) Which of the following is formed by the action of water on sodium peroxide ?


25) The H-0-H angle in water molecule is about


26) Which of the following acts as both reducing and oxidising agents ?


27) Which of the following will not displace hydrogen ?


28) The higher density of water than that of ice is due to


29) Hydrogen gas is generally prepared by the


30) Zeolite is


31) In para hydrogen, the electron spins are in the


32) Which of the following statement is correct?


33) Heavy water is usually prepared by the


34) The hydrogen molecule is not very reactive under normal condition because


35) The degree of hardness of water is usually expressed in terms of


36) Which of the following mixture is known as the fenton's reagent?


37) Ortho and para hydrogen differ in


38) Which of the following statement is incorrect ?


39) Which of the following statement is incorrect?


40) Which of the following metals form saline hydrides?


41) Water softening by clark's process uses


42) Which among the following is a hydride ?


43) Which is correct statement


44) The set of element which could form stable, covalent hydrogen bonded hydrides are


45) Temporary hardness and permanent hardness can be removed respectively by addition of


46) Which of the following evolves hydrogen on reacting with cold nitric acid ?


47) Which one of the following is not isotope of hydrogen ?


48) The property of hydrogen which distinguishes it from alkali metals is


49) The boiling point of water is exceptionally high because


50) A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly


51) One mole of magnesium nitride on the reaction with excess of water gives


52) Hydrogen will not reduce


53) The oxide that give hydrogen peroxide on treatment with dilute acid is


54) The sum of the number of neutrons and proton in the heaviest isotope of hydrogen is


55) When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with


56) Which of the following pair will not produce dihydrogen gas?


57) One mole of calcium phosphide on reaction with excess water give


58) Polyphosphate are used as water softening agent because they


59) Which of the following is correct about heavy water?


60) Which of the following hydrides in electron deficient ?


61) The maximum number of hydrogen bonds in which water molecules can participate is


62) Which is used hydrogen generators


63) Metal hydride on treatment with water gives


64) Hydrogen burns in air with a


65) Which pair does not show hydrogen isotopes


66) Which is distilled first


67) On reaction with Mg, very dilute nitric acid produces


68) Among the following, identify the compound which cannot act as both oxidising and reducing agents


69) Which of the following reaction produces hydrogen


70) Hydrogen resembles in many of its properties


71) Ortho and para hydrogen differ in


72) Hydrogen from HCl can be prepared by


73) Which of the following can adsorb largest volume of hydrogen gas


74) The colour of hydrogen is


75) Ordinary hydrogen at room temperature is a mixture of


76) Hydrogen cannot reduce


77) Hydrogen does not combine with


78) The adsorption of hydrogen by metals is called


79) Which of the following produces hydrolith with dihydrogen


80) The metal which displaces hydrogen from a boiling caustic soda solution is


81) Metals like platinum and palladium can absorb large volumes of hydrogen under special conditions. Such adsorbed hydrogen by the metal is known as


82) Which is poorest reducing agent


83) The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is


84) Ortho-hydrogen and para-hydrogen resembles in which of the following property


85) The difference between heat of adsorption of ortho and para hydrogen is


86) Hydrogen can be fused to form helium at


87) Which of the following metal do not liberate hydrogen from dilute hydrochloric acid


88) An element reacts with hydrogen to form a compound A which on treatment with water liberates hydrogen gas. The element can be


89) Hydrogen combines with other elements by


90) Which of the following explanation is best for not placing hydrogen with alkali metals or halogen


91) Which of the following terms is not correct for hydrogen


92) When electric current is passed through an ionic hydride in the molten state


93) Which of the halogen has maximum affinity for hydrogen


94) Which of the following statements is most applicable to hydrogen


95) Hydrogen is


96) Ionization energy of hydrogen is


97) Hydrogen acts as a reducing agent and thus resembles


98) Which position for hydrogen explain all its properties


99) Hydrogen readily combines with non-metals and thus it shows its


100) The oxidation states shown by hydrogen are


101) Hydrogen readily combines with metals and thus shows its


102) Electrolysis of fused sodium hydride liberate hydrogen at the


103) Protonic acid is


104) In all its properties, hydrogen resembles


105) Hydrogen molecule differs from chlorine molecule in the following respect


106) Which of the following statements concerning protium, deuterium and tritium is not true


107) Hydrogen has three isotopes, the number of possible diatomic molecules will be


108) In which of the compounds does hydrogen have an oxidation state of -1


109) Pure hydrogen is obtained by carrying electrolysis of


110) In Bosch's process which gas is utilised for the production of hydrogen gas


111) Deuterium differs from hydrogen in


112) Tritium undergoes radioactive decay giving


113) The gas used in the hydrogenation of vegetable oils in the presence of nickel as catalyst is


114) The conversion of atomic hydrogen into ordinary hydrogen is


115) The name hydrogen was given by


116) Triatomic hydrogen is called


117) Alkali metal hydrides react with water to give


118) Ionic hydrides are usually


119) Group 2 hydrides with significant covalent character is/are


120) Limiting compositions of f-block hydrides are


121) Which one of the following substances is used in the laboratory for a fast drying of neutral gases


122) Which is the lightest gas


123) The composition of tritium is


124) Which of the following gas is insoluble in water


125) Which element forms maximum compound in chemistry


126) Hydrogen is not obtained when zinc reacts with


127) An ionic compound is dissolved simultaneously in heavy water and simple water. Its solubility is


128) Synthetic detergents are more effective in hard water than soaps because


129) Temporary hardness may be removed from water by adding


130) Heavy water is


131) Heavy water is compound of


132) Which of the following pair of ions makes the water hard


133) Temporary hardness of water can be removed by


134) When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with


135) Which of the following statements do not define the characteristic property of water "Water is a universal solvent"


136) The velocity of neutrons in nuclear reactor is slowed down by


137) Temporary hardness of water is due to the presence of


138) Which of the following is not true


139) Which of the following is not a hard water


140) Heavy water is used in atomic reactor as


141) Heavy water freezes at


142) Which of the following is not true


143) Which of the following will determine whether the given colourless liquid is water or not


144) Lead pipes are not used for carrying drinking water because


145) Which one of the following removes temporary hardness of water


146) Which of the following will cause softening of hard water


147) Which of the following process permanent hardness of water can be removed, by adding


148) Permutit is technical name given to


149) The approximate mass of tritium oxide molecule is


150) Molecular weight of heavy water is


151) Water is said to be permanently hard when it contains


152) Sodium sulphate is soluble in water but barium sulphate is insoluble because


153) The alum used for purifying water is


154) Which of the following is correct about heavy water


155) The H - O - H angle in water molecule is about


156) pH of neutral water at room temperature nearly


157) The low density of ice compared to water is due to


158) Triple point of water is


159) Hardness of water is due to presence of salts of


160) In which of the following reaction hydrogen peroxide is a reducing agent


161) There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength


162) Hydrogen peroxide is reduced by


163) Fenton's reagent is


164) Hydrogen peroxide is used as


165) Which one of the following is a true peroxide


166) Which of the following statements is incorrect


167) Nitrates of all metals are


168) Polyphosphates are used as water softening agents because they


169) One mole of calcium phosphide on reaction with excess water gives


170) Hydrogen peroxide is


171) Hydrogen can be obtained from water by


172) Which of the following is/are hard water(s)


173) Pick the odd one out


174) Hydrogen can be obtained from water, by the action of water on


175) What is true about ice


176) Hydrogen will not reduce


177) Which of the following pair will not produce dihydrogen gas


178) Hydrogen can behave as a metal


179) Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy is


180) Saline hydrides react explosively with water, such fires can be extinguished by


181) Metals of groups 7, 8 and 9 do not form metallic hydrides. This is termed as


182) The most abundant element in the universe is


183) Pick out the correct statement


184) Hydrogen can be produced by heating


185) Plumbosolvency is a health hazard in the transportation of


186) A sample of water contains sodium chloride. It is


187) Hardness producing salt, whose solubility in water decreases with rise of temperature is


188) A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will be


189) Water obtained by purification with organic ion exchange resins is


190) Which of the following can effectively remove all types of hardness of water


191) Assertion: Hydrogen combines with other elements by losing, gaining or sharing of electrons.
Reason: Hydrogen forms electrovalent and covalent bonds with other elements.


192) Assertion: Acidulated water is an example of hard water.
Reason: In the presence of an acid, soap is converted into insoluble free fatty acids.


193) Assertion: Hydrogen peroxide forms only one series of salts called peroxides.
Reason: Hydrogen peroxide molecule has only one replaceable hydrogen atom.


194) The percentage of para hydrogen in ordinary hydrogen increases when:


195) Radioactive isotope of hydrogen is


196) The hardness of water is estimated by


197) The ortho and para hydrogen possess:


198) Which is not present in clear hard water?


199) Which of the following reactions produces hydrogen?


200) When different metals like Zn, Sn, Fe are added to dilute sulphuric acid, same gas, which burns explosively in air, is evolved. The gas is:


201) Heavy water is represented as


202) Which is not a water softener?


203) The boiling point of heavy water is:


204) Which will produce hard water?


205) Which of the following pairs will not produce dihydrogen gas?


206) Calgon used as water softner is


207) Permutit is:


208) The rubber foam is produced by passing oxygen through rubber foaming material. This oxygen is released from:


209) Which is the poorest reducing agent?


210) The number of radioactive isotopes of hydrogen is:


211) The oxidation number of oxygen in hydrogen peroxide is


212) The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. The hydrogen peroxide.


213) The ortho and para hydrogen differ in respect of which of the following?


214) The bond energy of covalent O—H bond in water is:


215) An aqueous solution of hydrogen peroxide is


216) Tritium emits:


217) The ratio of electron, proton and neutron in tritium is:


218) Permutit is the technical name given to


219) The best method to test whether a clear liquid is water, is to:


220) Heavy water is qualified as heavy because it is:


221) Permanent hardness can be removed by adding


222) The ionization energy of hydrogen is:


223) Hydrogen peroxide is prepared in the laboratory by


224) Hydrogen peroxide is manufactured by the auto-oxidation of:


225) Hydrogen may be prepared by heating a solution of caustic soda with:


226) The most reactive state of hydrogen is:


227) The number of protons, electrons and neutrons respectively in a molecule of heavy water is:


228) Ordinary hydrogen is a mixture at:


229) The electronic configuration of deuterium is:


230) Tailing of mercury is a laboratory test for:


231) Which method cannot be used to remove hardness of water?


232) Which of the following could act as a propellant for rockets?


233) Deuterium was discovered by:


234) Heavy water possesses:


235) Which one of the following is called amphoteric solvent?


236) Which hydride is neutral?


237) Hydrogen burns with:


238) Deuterium, an isotope of hydrogen is:


239) Temporary harness is caused due to the presence of:


240) The life period of atomic hydrogen is:


241) There is a sample of 20 volume of hydrogen peroxide solution. Calculate its strength


242) When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is:


243) Atomic hydrogen is obtained by:


244) Which loses weight on exposure to the atmosphere?


245) Which can adsorb large volumes of hydrogen gas?


246) In the hydrogen peroxide molecule:


247) Fluorine reacts with water to form:


248) The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre of water is expressed as


249) When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of


250) Ordinary hydrogen has preponderance of:


251) Which of the following is an example of interstitial hydride?


252) If water is boiled for sometime it becomes free from:


253) Polyphosphates are used as water softening agents because they


254) Hydrogen molecules are:


255) Hydrogen reacts with …… even in the dark.


256) The pair that yields the same gaseous product on reaction with water:


257) The heaviest among the following is:


258) The molarity of a 100 mL solution containing 5.1 g of hydrogen peroxide is:


259) The metal that does not displace hydrogen from an acid is:


260) Deionised water is obtained by passing hard water through


261) Hydrogen was discovered by:


262) Hard water becomes free from …… ions when passed through ion exchange resin containing RCOOH groups.


263) The sum of number of neutrons and protons in one of the isotopes of hydrogen is:


264) Water contracts on heating:


265) Hydrogen combines directly with:


266) Which statement about zeolite is false?


267) High boiling point of water is due to:


268) Sodium zeolite is:


269) Hydrogen is not used for:


270) Heavy water is manufactured in India at:


271) The ionization of hydrogen atom gives:


272) The melting points of most of the solid substances increase with an increase of pressure. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because:


273) Heavy water was discovered by:


274) The maximum possible number of hydrogen bonds a water molecule can form is:


275) Hydrogen gas will not reduce:


276)
The hardness of water is due to …. Metal ions.


277) Under what conditions of temperature and pressure, the formation of atomic hydrogen from molecular hydrogen will be favoured more?


278) Heavy water is not used for dinking because:


279) Maximum density of heavy water is at:


280) A molten ionic hydride on electrolysis gives:


281) Both temporary and permanent hardness are removed on boiling water with:


282) The weight percentage of deuterium in heavy water is:


283) Very pure hydrogen(99.9%) can be made by which of the following processes?


284) Density of water is maximum at:


285) The most reactive isotope of H is:


286) The exhausted Permutit is generally regenerated by percolating through it a solution of:


287) The best explanations for not placing hydrogen with the group of alkali metals or halogens is:


288) The geometry of water molecule is same as that of:


289) Hydrogen peroxide does not:


290) The most dangerous method of preparing hydrogen would be by the action of dil. HCl and:


291) Hydrolysis of one mole of peroxodisulphuric acid produces:


292) During hydrogenation of oil the catalyst commonly used is:


293) Oxygen and hydrogen react to form water. This discovery was made by:


294) Which one of the following processes will produce hard water?


295) Ionic hydrides react with water to give


296) Hydrogen peroxide for the first time was prepared by:


297) Para hydrogen is:


298) Some statements about heavy water are given below:
(i) Heavy water is used as a moderator in nuclear reactors
(ii) Heavy water is more associated than ordinary water
(iii) Heavy water is more effective solvent than ordinary water
Which of the above statements are correct?


299) When hydrolith is treated with water it yields:


300) Atomic hydrogen produces formaldehyde when it reacts with:


301) Hydrogen peroxide is now generally prepared on industrial scale by the:


302) Tritium is obtained by:


303) The formula of heavy water is:


304) Hydrogen adsorbed on palladium is known as:


305) Which one of the following is used for reviving the exhausted ‘permutit’?


306) Nascent hydrogen consists of:


307) At absolute zero:


308) Hydrogen peroxide works as:


309) Point out the incorrect statement.


310) Hydrogen is prepared on large scale for industrial use


311) Hydrogen is obtained by the action of an alloy of silicon and iron with NaOH. The process is called:


312) Hydrogen peroxide when added to a solution of potassium permanganate acidified with sulphuric acid


313) Water is oxidised to oxygen by


314) In the preparation of hydrogenated oil the chemical reaction involving hydrogen is called:


315) The most abundant isotope of hydrogen is:


316) Which statement is not correct for hydrogen peroxide?


317) Which one is correct for perhydrol?


318) Hydrogen has a tendency to gain one electron in order to acquire helium configuration. It thus, resembles:


319) Calgon is an industrial name given to:


320) For the bleaching of hair, the substance used is:


321) In solid hydrogen, the intermolecular bonding is:


322) The species that does not contains peroxide ions is:


323) When silicon is boiled with caustic soda solution, the gas evolved is:


324) In which of the following reactions hydrogen peroxide is a reducing agent?


325) Which does not react with cold water?


326) Deuterium resembles hydrogen in chemical properties but reacts:


327) Statement 1: NaCl is less soluble in heavy water than in ordinary water.
Statement 2: Dielectric constant of ordinary water is more than that of heavy water.


328) Statement 1: Hard water is more suitable than soft water.
Statement 2: Hard water can be used in steam boilers.


329) Statement 1: Water has high boiling point.
Statement 2: Water shows hydrogen bonding.


330) Statement 1: Temporary hardness can be removed by boiling.
Statement 2: One boiling the soluble bicarbonates change to carbonates which being insoluble get precipitated.


331) Statement 1: Hydrogen shows resemblance with alkali metals as well as halogens.
Statement 2: Hydrogen exists in atomic form only at high temperature.


332) Statement 1: Hydrogen ahs only two isotopes namely protium and deuterium .
Statement 2: Protium is radio active in nature.


333) Statement 1: Saline hydrides are nonvolatiles noe conducting and crystalline solids.
Statement 2: Saline hydrides are compounds of hydrogen with most of the p block elements