Practice Test

Q1) Photographic plates are covered with black paper because Show Answer

Q2) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of Show Answer

Q3) A dilute solution of sodium carbonate was added to two test tubes -one containing dil HCl (A) and the other containing dilute NaOH (B). The correct observation was- Show Answer

Q4) Which one of the following is a combination reaction ? Show Answer

Q5) Which one of the following is decomposition reaction ? Show Answer

Q6) A positive catalyst increases rate of reaction by Show Answer

Q7) Which salt can be classified as an acid salt? Show Answer

Q8) Which of the following is a homogenous reaction ? Show Answer

Q9) The gas whose aqueous solution is strongly acidic in nature is Show Answer

Q10) Which of the following reaction is based on activity series of metals?
Show Answer

Q11) In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? Show Answer

Q12) Two test-tube 'A' and 'B' contain aqueous solution of potassium iodide and lead nitrate separately. when these two test-tubes 'A; and 'B' are mixed to each other result into 'X' and 'Y'. the 'X' and 'Y' are: Show Answer

Q13) If pH ,f A, B, C and D are , 9.5, 2.5, 3.5 and 5.5 respectively, then strongest acid is Show Answer

Q14) A student added dilute HCl to a test-tube containing zinc granules and made following observations:
1) The zinc surface become dull and black.
2) A gas evolved which burnt with a pop sound.
3) The solution remained colourless .
Correct observation are - Show Answer

Q15) Why bases are kept in glass bottles? Show Answer

Q16) pH of human body varies with in the range of Show Answer

Q17) To protect tooth decay we are advised to brush our teeth regularly . the nature of the tooth paste commonly used is Show Answer

Q18) A balance chemical equation is in accordance with . Show Answer

Q19) A change is said to be a chemical charge when - Show Answer

Q20) Which of the following statements is true ? Show Answer

Q21) Which one is not a balanced equation ? Show Answer

Q22) In a combination reaction, how many products are formed? Show Answer

Q23) Which of the following statements is not correct ? Show Answer

Q24) Which of the following reactions involved the combination of two element ? Show Answer

Q25) A redox reaction is one in which - Show Answer

Q26) HCl gas changes the colour of Show Answer

Q27) When the stopper of a bottle containing colourless liquid was removed, the bottle gave smell like that of vinegar. The liquid in the bottle could be Show Answer

Q28) The pH is less than 7 of the solution of Show Answer

Q29) Which of the following reaction is endothermic ? Show Answer

Q30) In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. while performing the activity if lead nitrate is not available , which of the following can be used in place of lead nitrate? Show Answer

Q31) The colour of pH paper when put in distilled water changed to green,. Now some common salt is added to water and pH paper is tested in this solution. The colour of pH paper in this case is likely to be Show Answer

Q32) The pH of gastric juice that is released during digestion is Show Answer

Q33) When HCl (g) is passed through water , it Show Answer

Q34) Which of the following is a strong base? Show Answer

Q35) Acids are ______________in taste while bases are ____________in taste . Show Answer

Q36) A base which dissolves in water is called Show Answer

Q37) Which of the following statement regarding bases is false? Show Answer

Q38) During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to Show Answer

Q39) What happens when copper rod is dipped in iron sulphate solution ? Show Answer

Q40) Lead nitrate on decomposition gives
1) lead oxide
2) nitrogen dioxide
3) oxygen
4) nitrogen Show Answer

Q41) Photochemical reaction have the following characteristic :
1) These requires photons to interact with chemical species.
2) Each molecules absorbs only one photon to get itself excited.
3) It is not necessary for an excited molecule to show always chemical change.
4) Light is not essential for photochemical reaction. Show Answer

Q42) Acids and bases are important because of -
1) their use in industry.
2) their effects on human health.
3) their effects on farmer's crops.
4) their use in neutralization to form salts. Show Answer

Q43) Which of the following are considered as a base?
1) Proton Donor
2) Proton Acceptor
3) Electron Acceptor
4) Electron Donor
Show Answer

Q44) Consider the following statements.
1) A physical change can be easily reversed by a slight change of conditions.
2) A physical change is accompanied by a change in colour of the substances.
3) It is possible to characteristic a chemical reaction by only a change in state.
which of the above statement(s) is/are incorrect? Show Answer

Q45) Photochemistry is involved in
1) fading of colour of fabric in sunlight
2) photography
3) printing
4) polymerisation
Show Answer

Q46) Which of the following are chemical change?
1) Digestion of food
2) Liquefaction of air
3) Ripening of fruit
4) Dissolution of sulphur in carbon disulphide
5) Freezing of water
6) Electrolysis of water Show Answer

Q47) Consider the following statements:
1) It is possible to write a symbol equation if we do not know the word equation .
2) A chemical equation is always written under N.T.P
conditions.
3) In a chemical equation the diatomic gases must be written in the molecular form.
Which of these statement(s) is/are correct? Show Answer

Q48) Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat . This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are ) true about slaking of lime and the solution formed?
1) It is an endothermic reaction.
2) It is an exothermic reaction
3) The pH of the resulting solution will be more than seven
4) The pH of the resulting solution will be less than seven Show Answer

Q49) When few drops of lemon are mixed milk
1) it turns sour
2) no change takes place
3) properties of milk are changed
4) properties of milk remain same
Which of the above statement(s) is/are correct? Show Answer

Q50) What is correct for following ?
1) Lemon juice
2) Solution of washing soda
3) Toothpaste
4) Stomach juices
5) Vinegar

Show Answer

Q51) Consider the following statements:
1) Whether water acts as acid or as a base depends on the other species present.
2) Every liquid is either an acid or a base.
Which of these statement(s) above is/are correct?
Show Answer

Q52) Consider the following statements:
1) the number of atoms of each element is conserved in any chemical reaction.
2) A complete chemical equation represents the reactants, products and their physical states symbolically.
Which of these statements(s) is/are correct? Show Answer

Q53) Consider the following statements:
1) Calcium carbonate is the product formed when calcium oxide reacts with carbon dioxide gas.
2) The precipitate of zinc sulphide is black in colour.
Which of these statements(s) above is/are correct? Show Answer

Q54) Consider the following statements:
1) A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, magnesium oxide.
2) The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction
3) Action of heat on ferrous sulphate is an example of decomposition reaction.
Which of these statements(s) is/are correct? Show Answer

Q55) Sodium hydrogencarbonate when added to acetic acid evolves a gas. Which of the following are true about the gas evolved?
1) It turns lime water milky
2) It extinguishes a burning splinter
3) It dissolves in a solution of sodium hydroxide
4) It has a pungent odor Show Answer

Q56) Consider the following statements:
1) Living beings carry out their metabolic activities with in an optimal pH range.
2) There are a variety of strengths when you study acids and base.
Which of these statements(s) above is/are correct? Show Answer

Q57) Consider the following statements:
1) When a base reacts with a metal, along with the evolution of hydrogen gas a salt is formed which has a positive ion composed of the metal and oxygen.
2) Acidic and basic solution in water conduct electricity because they produce hydrogen and hydroxide ions respectively.
3) Acids and bases neutralize each other to form corresponding salts and water.
Which of these statements are correct? Show Answer

Q58) Assertion : A catalyst remain unchanged in composition and quantity at the end of the reaction
Reason : Catalysts are sometimes very specific in respect of reaction Show Answer

Q59) Assertion : The rate of reaction decreases with decrease of concentration and increases with increase of concentration of reactants.

Reason : The rate of reaction is directly proportional to the concentration of reactants . Show Answer

Q60) Assertion : Emission of light during a chemical reaction is known as chemiluminescence
Reason : Some substances absorb radiation when exposed to it and immediately re-emit the energy absorbed. Show Answer

Q61) Assertion : pH of hydrochloric acid solution is less than that of acetic acid solution of the same concentration.
Reason : In equimolar solutions, the number of titrable protons present in hydrochloric acid is less than that present in acetic acid. Show Answer

Q62) With reference to the ionic compounds consider the following statements
1) Ionic compounds are insoluble in alcohol
2) Ionic compounds in the solid state are good conductor of electricity
Which of these statements is/are correct ? Show Answer

Q63) Select the incorrect statement/ Show Answer

Q64) Which of the following statements is/are true
1) The process of oxidation leads to gain of electron.
2) The process of oxidation leads to loss of electron.
3) The process of reduction leads to gain of electron.
4) The process of reduction leads to loss of electron. Show Answer

Q65) The common oxidation state of alkali metals in the combined state is Show Answer

Q66) Assertion (A) In a chemical reaction, a catalyst increases the rate of a reaction.
Reason (R) Catalyst possess high activation energy. Show Answer

Q67) The temperature at which the catalyst activity of the catalyst is maximum, is called Show Answer

Q68) Which of the following are true regarding a catalyst ?
1) It is a substance which increases the rate of reaction.
2) It is a substance which reduces the activation energy.
3) It is a substance which increase the activation energy.
4) It is a substance which is consumed in the reaction.
Show Answer

Q69) Acid rain is caused by the pollution of environment by Show Answer

Q70)
Photochemical smog is a resultant of the reaction among Show Answer

Q71) Combustion of a candle is Show Answer

Q72) When iron nails are keep in copper sulphate solution, iron will get Show Answer

Q73) Which of these elements always shows negative oxidation state ? Show Answer

Q74) Due to the accumulation of which acid we felt tired ? Show Answer

Q75) Assertion (A) Baking soda is used to make cake light and spongy.
Reason (R) Baking soda evolve carbon dioxide gas with weak acids.
The correct option is Show Answer

Q76) Fluorescent tubes contain Show Answer

Q77) Which of the following is mainly responsible for explosion in coal mines ? Show Answer

Q78) Biogas contains mainly Show Answer

Q79) Assertion (A) Alum is used to purify water.
Reason (R) It coagulates the impurities present in water. Show Answer

Q80) Polythene bags cannot be destroyed because these are made up of Show Answer

Q81)
IC chips of computers are made up of Show Answer

Q82) Which is an antidot for lead poisoning ? Show Answer

Q83) Brown coal is Show Answer

Q84) Dry ice is used for making cold-baths in laboratories by mixing with volatile of dry ice from the following Show Answer

Q85) Assertion (A) The covalent bond is formed by the sharing f pairs of electrons by the sharing of pairs of electrons between atoms
Reason (R) Covalency is greatest between atoms of different electronegativities Show Answer

Q86) Consider the following statements
1) Metallic bond are malleable and ductile.
2) Covalent compounds are generally non-conductor of electricity.
3) Ionic compounds are goods conductor of electricity in molten or liquid state.
Which of the statements given above are correct ? Show Answer

Q87) Which of the following represent a chemical change ?
1) Magnetization of iron.
2) Condensation of liquid
3) Burning of fuel
4) Rusting of iron.
Select the correct answer using the codes given below. Show Answer

Q88) When ammonium chloride is dissolved in water, the solution becomes cold. The change is Show Answer

Q89) Consider the following statements regarding a motor car battery.
1) The voltage is usually 12.V
2) Electrolyte used is hydrochloric acid.
3) Electrodes are lead and copper.
4) Capacity is ampere-hour
Which of the above statement are correct ? Show Answer

Q90) Which one of the following pairs of material serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers etc ? Show Answer

Q91) Consider the following statements
1) Albo iron does not rust in vacuum because air is necessary for rusting.
2) Rust is faster in sea water because of dissolved salts.
Which of the statement(s) given above is/are correct ? Show Answer

Q92) Which one of the following statements regarding starch and cellulose is not correct ? Show Answer

Q93) The origin of intermolecular forces is because of Show Answer

Q94) Coordinate covalent compounds are formed by Show Answer

Q95) In the covalent valency Show Answer

Q96) Consider the following statements about ionic bond.
1) Ionic bond comes into existance by the transference of electrons between the participating atoms.
2) The atom losing electron changes into cation while the other atom gaining electrons converted into
anion.
Which of the statements given above is/are correct ? Show Answer

Q97) The shape of the ethylene molecules is Show Answer

Q98) Anode mud is a Show Answer

Q99) Salts of which of the following elements provide colours to the works ? Show Answer

Q100) Physical change is an example of Show Answer

Q101) What form of energy is produced in the decomposition of water? Show Answer

Q102) Aluminium phosphide is used as Show Answer

Q103) What is the shape of sulphur hexafluoride molecule? Show Answer

Q104) Phenol is used in the manufacture of which one of the following? Show Answer

Q105) The predominant organic acid in grapes is Show Answer

Q106) Which one of the following acids is used in the manufacturing of baking powder? Show Answer

Q107) Which one of the following is not an explosive : Show Answer

Q108) Which one of the following statement is correct? Show Answer

Q109) Which one of the following is another name of RDX? Show Answer

Q110) Which one of the following chemicals had been in use till now for making artificial clouds ? Show Answer

Q111) The substance used for artificial rain is Show Answer

Q112) Because of impurities the boiling point of a liquid – Show Answer

Q113) Why does water boil at temperature below 1000C at higher altitudes ? Show Answer

Q114) Which one of the following chemicals helps in fruit ripening? Show Answer

Q115) Which of the following chemicals is used for repining ? Show Answer

Q116) Of how many carats is the pure gold? Show Answer

Q117) Chemically “Plaster of Paris” is :
Show Answer

Q118) The chemical formula of the Plaster of Paris is- Show Answer

Q119) Doctors, Artists and Sculptors use calcium sulphate which is popularly known as Show Answer

Q120) Which of the Following is in liquid form at room temperature? Show Answer

Q121) Liquid crystals are used in : Show Answer

Q122) The World’s most accurate clock that loses just a second every 300 million years used Show Answer

Q123) A tachyon stands for Show Answer

Q124) Tetraethyl lead (TEL) is added to petrol : Show Answer

Q125) Which one of the following is used as an anti-freeze for the automobile engines ? Show Answer