NSS Chemistry Part 15 Analytical Chemistry _MC

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NSS Chemistry Part 15 Analytical Chemistry (Multiple Choice Questions)

HKCEE Past Paper Questions

1. 1995 Q14 A mixture consists of two solids, sodium chloride and lead(II) oxide. Which of the following methods

can be used to remove the sodium chloride from the mixture? A. Add water to the mixture and then filter. B. Add concentrated sulphuric acid to the mixture and then filter. C. Add dilute nitric acid to the mixture and then filter. D. Add dilute sodium hydroxide solution to the mixture and then filter.

Ans: A

2. 1995 Q17 Compound X is a white solid. When X is warmed with sodium hydroxide solution, a gas is evolved

which turns moist red litmus paper blue. When chlorine water is added to an aqueous solution of X, a brown solution is formed. X is probably A. ammonium bromide. B. ammonium chloride. C. sodium bromide. D. sodium chloride.

Ans: A

3. 1995 Q20 Which of the following statements concerning alkenes is INCORRECT?

A. They can decolorize a solution of bromine in 1,1,1-trichloroethane. B. They can decolorize red litmus solution. C. They can decolorize acidified potassium permanganate solution. D. They can be polymerized to form addition polymers.

Ans: B

4. 1996 Q17 A gardener bought a bag of potassium nitrate and a bag of ammonium sulphate, to be used as

fertilizers. He forgot to label the bags. Which of the following tests would enable him to distinguish between the two chemicals? A. heating each chemical with dilute sulphuric acid B. heating each chemical with sodium chloride solution C. heating each chemical with potassium hydroxide solution D. heating each chemical with acidified potassium dichromate solution

Ans: C

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5. 1996 Q33 A mixture contains only copper(II) oxide and anhydrous copper(II) sulphate. Which of the following

methods can be used to separate copper(II) oxide from the mixture? (1) Add water to the mixture and then filter. (2) Add dilute nitric acid to the mixture and then filter. (3) Add concentrated hydrochloric acid to the mixture and then filter. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: A

6. 1997 Q9 Metal X reacts with dilute nitric acid to give a colourless solution. When sodium hydroxide solution is

added to the solution, a white precipitate which dissolves in excess sodium hydroxide solution is formed. X is probably A. copper. B. iron. C. lead. D. magnesium.

Ans: C

7. 1997 Q15 Which of the following substances, when mixed, would produce a precipitate?

A. chlorine water and potassium bromide solution B. ethyl ethanoate and ethanol C. iron(III) sulphate solution and aqueous ammonia D. nitric acid and potassium hydroxide solution

Ans: C

8. 1997 Q23 Which of the following set-ups should be connected to the delivery tube to collect the gaseous

products formed?

A.

B.

9. 1997 Q36 Which of the following substances

concentrated sulphuric acid? (1) sodium carbonate powder (2) copper turnings (3) cane sugar

A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

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ups should be connected to the delivery tube to collect the gaseous

C.

D.

Which of the following substances can be used to distinguish between concentrated nitric acid and

ups should be connected to the delivery tube to collect the gaseous

Ans: D

can be used to distinguish between concentrated nitric acid and

Ans: C

10. 1997 Q37 Which of the following substances would react with sodium hydroxide solution?

(1) ammonium chloride solution(2) copper(II) sulphate solution (3) ethanoic acid


11. 1998 Q12

A gas X is bubbled into a solution of combinations would X react with

X Y A. ammonia potassium iodide B. chlorine potassium nitrate C. carbon dioxide sodium hydroxide D. sulphur dioxide iron(II) sulphate

12. 1998 Q25 Dilute sodium hydroxide solution is added successively to four different solutions. Which of the

following combinations is correct? Solution Observation A. ammonium chloride white precipitate B. lead(II) nitrate yellow precipitate C. potassium dichromate orange precipitate D. iron(III) sulphate brown precipitate

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following substances would react with sodium hydroxide solution?ammonium chloride solution

is bubbled into a solution of Y as shown in the above diagram. In which of the following react with Y?

Y potassium iodide potassium nitrate sodium hydroxide iron(II) sulphate

Dilute sodium hydroxide solution is added successively to four different solutions. Which of the following combinations is correct?

Observation white precipitate yellow precipitate orange precipitate brown precipitate

following substances would react with sodium hydroxide solution?

Ans: D

as shown in the above diagram. In which of the following

Ans: C

Dilute sodium hydroxide solution is added successively to four different solutions. Which of the

Ans: D

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13. 1998 Q26 Some physical properties of a compound X are listed below: melting point : 82oC boiling point : 221oC solubility in water : soluble

Which of the following is the most appropriate method to obtain X from a solution of X in water? A. decantation B. crystallization C. fractional distillation D. paper chromatography

Ans: B

14. 1998 Q29 X is a compound containing four carbon atoms. It gives negative results with the following tests.

Test (1) Treating X with sodium hydrogencarbonate solution (2) Treating X with a solution of bromine in 1,1,1-trichloroethane (3) Heating X with acidified potassium dichromate solution

The structure formula of X may be A. CH3CH2CH=CH2. B. CH3CH2CH2CH2OH. C. CH3CH2CH2CO2H. D. CH3CO2CH2CH3.

Ans: D

15. 1999 Q7 Substance X gives identical product(s) when treated with dilute sulphuric acid or concentrated

sulphuric acid. X may be A. zinc. B. cane sugar. C. ammonia. D. hydrated copper(II) sulphate crystals.

Ans: C

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16. 1999 Q11 The table below shows the ability of four substances W, X, Y and Z to conduct electricity. (In the table, and respectively represent can conduct electricity and cannot conduct

electricity.) Substance Solid State Liquid State Aqueous Solution

W X Y Z (insoluble in water)

Which of the substances is likely to be zinc chloride? A. W B. X C. Y D. Z

Ans: A

17. 1999 Q18 Which of the following processes would NOT produce hydrogen gas? A. adding calcium to water B. adding magnesium to dilute hydrochloric acid C. adding copper to dilute nitric acid D. passing steam over red hot iron

Ans: C

18. 1999 Q20 Which of the following solutions would produce a white precipitate with sodium hydroxide solution?

A. lead(II) nitrate solution B. iron(III) nitrate solution C. copper(II) nitrate solution D. potassium nitrate solution

Ans: A

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19. 1999 Q32 Which of the following substances can react with acidified potassium permanganate solution?

(1) ethene (2) copper(II) sulphate solution (3) iron(II) sulphate solution

A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: C

20. 1999 Q37 Which of the following substances can react with magnesium to give a colourless gas which a pop

sound? (1) grapefruit juice (2) citric acid crystals (3) household bleach


Ans: A

21. 2000 Q6 Which of the following pairs of compounds can be distinguished by treating with an acidified

potassium dichromate solution? A. ethane and ethene B. ethanol and propan-1-ol C. sodium carbonate and sodium hydrogencarbonate D. sodium sulphite and sodium sulphate

Ans: D

22. 2000 Q13 Consider the compounds represented by the two structures below:

Which of the following statements concerning these compounds is correct?A. Both compounds can turn wet blue litmus paper red.B. Both compounds have the same odour.C. Both compounds have the same molecular formula.D. Both compounds have the same boiling point.

23. 2000 Q18 Some potassium carbonate solution is added to a sample of tap water. The mixture then appears

cloudy. Which of the following ions is probably present in the samplA. NH4+ B. Mg2+ C. Br D. SO42

24. 2000 Q22 A white solid dissolves in water to give an alkaline solution. The solution reacts with dilute

hydrochloric acid to give a gas. The solid is probablyA. calcium oxide. B. calcium carbonate. C. potassium hydroxide. D. potassium carbonate.

25. 2000 Q24 Which of the following compounds is insoluble in water?

A. methanol B. methanoic acid C. methyl methanoate D. sodium methanoate

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Consider the compounds represented by the two structures below:

Which of the following statements concerning these compounds is correct? Both compounds can turn wet blue litmus paper red. Both compounds have the same odour.

the same molecular formula. Both compounds have the same boiling point.

Some potassium carbonate solution is added to a sample of tap water. The mixture then appears cloudy. Which of the following ions is probably present in the sample?

A white solid dissolves in water to give an alkaline solution. The solution reacts with dilute hydrochloric acid to give a gas. The solid is probably

Which of the following compounds is insoluble in water?

Ans: C

Some potassium carbonate solution is added to a sample of tap water. The mixture then appears

Ans: B

A white solid dissolves in water to give an alkaline solution. The solution reacts with dilute

Ans: D

Ans: C

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26. 2001 Q5 Which of the following substances can conduct electricity in both solid and liquid states? A. sulphur B. mercury C. quartz D. lead(II) bromide

Ans: B

27. 2001 Q7 Which of the following statements concerning water is correct? A. It reacts with calcium to give a colourless gas. B. It is a strong electrolyte. C. It turns anhydrous cobalt(II) chloride from pink to blue. D. It is immiscible with methanol.

Ans: A

28. 2001 Q11 Which of the following pairs of solutions, when mixed, would produce a precipitate? A. lead(II) nitrate and sodium hydroxide B. copper(II) sulphate and sodium nitrate C. zinc chloride and potassium nitrate D. iron(II) sulphate and acidified potassium permanganate

Ans: A

29. 2001 Q18 Consider the following information about four substances, W, X, Y and Z:

Substance Melting Point/oC Electrical conductivity at room temperature W 23 poor X 56 poor Y 232 good Z 750 poor

Which substance has a simple molecular structure and is a solid at room termperature? A. W B. X C. Y D. Z

Ans: B

30. 2001 Q28

The set-up shown above is best used to collectA. ammonia. B. chlorine. C. nitrogen. D. sulphur dioxide.

31. 2001 Q40 In which of the following experiments would a gas be produced?(1) adding water to a solid mixture of citric acid and sodium hydrogencarbonate(2) adding dilute hydrochloric acid to sodium hypochlorite solution(3) adding chlorine water to potassium iodide solution


32. 2002 Q2 Which of the following compounds, when dissolved in water, gives a green solution?

A. copper(II) sulphate B. nickel(II) sulphate C. cobalt(II) chloride D. iron(III) sulphate

33. 2002 Q17 Which of the following solutions does A. ammonium chloride solutionB. potassium carbonate solutionC. copper(II) nitrate solution D. zinc sulphate solution

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up shown above is best used to collect

In which of the following experiments would a gas be produced? adding water to a solid mixture of citric acid and sodium hydrogencarbonateadding dilute hydrochloric acid to sodium hypochlorite solution

to potassium iodide solution

Which of the following compounds, when dissolved in water, gives a green solution?

Which of the following solutions does NOT react with sodium hydroxide solution?ammonium chloride solution potassium carbonate solution

Ans: C

adding water to a solid mixture of citric acid and sodium hydrogencarbonate

Ans: A

Which of the following compounds, when dissolved in water, gives a green solution?

Ans: B

react with sodium hydroxide solution?

Ans: B

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34. 2002 Q19 Which of the following acids, when heated with copper, would produce a gas? A. dilute nitric acid B. dilute hydrochloric acid C. dilute sulphuric acid D. concentrated ethanoic acid

Ans: A

35. 2002 Q22 Which of the following methods should be used to obtain hydrated copper(II) sulphate from copper(II)

sulphate solution? A. crystallization B. distillation C. fractional distillation D. heating under reflux

Ans: A

36. 2002 Q24 Which of the following statements concerning sodium hydroxide is INCORRECT? A. It is manufactured by treating sodium with water. B. Its concentrated solution is corrosive. C. It is used in the manufacture of soapless detergents. D. It absorbs carbon dioxide when exposed to air.

Ans: A

37. 2002 Q28 Which of the following substances does not conduct electricity in its solid state but does conduct

electricity in its liquid state? A. lithium chloride B. phosphorus C. platinum D. Perspex

Ans: A

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38. 2002 Q32 A black powder is suspected to be carbon or a mixture of carbon and copper(II) oxide. Which of the

following methods can be used to identify the black powder? (1) adding dilute sulphuric acid to the powder (2) adding sodium hydroxide solution to the powder (3) heating the powder strongly A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: C

39. 2002 Q37 Which of the following methods can be used to distinguish between iron(II) sulphate solution and

iron(III) sulphate solution? (1) observing their colours (2) adding acidified potassium permanganate solution (3) adding aqueous ammonia A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

Ans: D

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40. 2002 Q38 Which of the following set-ups can be used to dry moist sulphur dioxide gas? (1) (2)

(3)


Ans: B

41. 2002 Q44 Both ethene and ethyne are gaseous hydrocarbons. Their structures are shown below:

Which of the following statements concerning ethene and ethyne are correct? (1) Both are unsaturated hydrocarbons. (2) Both are insoluble in water. (3) Ethyne burns with a more sooty flame than ethene.


Ans: D

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42. 2003 Q13 Which of the following substances will NOT react with bromine water? A. propene B. sulphur oxide C. potassium iodide solution D. ammonium chloride solution

Ans: D 43. 2003 Q21 Which of the following solutions would NOT undergo a colour change when mixed with sodium

sulphite solution? A. iodine solution B. acidified potassium permanganate solution C. chromium (III) sulphate solution D. iron (III) sulphate solution

Ans: C

44. 2003 Q27 Which of the following pairs of substances can be distinguished by using dilute hydrochloric acid?

A. NaCl and NaOCl B. NH4Br and NH4I C. K2CO3 and KHCO3 D. CaO and Ca(OH)2

Ans: A

45. 2003 Q31 Propene is an unsaturated hydrocarbon. Which of the following reactions is/are characteristic of the

unsaturated nature of propene? (1) It undergoes incomplete combustion to give carbon monoxide. (2) It decolourises acidified potassium permanganate solution. (3) It undergoes polymerization to give polypropene.


Ans: D

46. 2003 Q38 The structures of two organic compounds are shown below:

Which of the following statements concerning these two compounds is/are correct?(1) They have the same relative molecular mass.(2) They have the same chemical properties.(3) They are both soluble in water.A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

47. 2003 Q43 Which of the following pairs of solutions would from a precipitate when they are mixed?(1) NH4Cl(aq) and K2SO4(aq) (2) NH3(aq) and Pb(NO3)2(aq) (3) (NH4)2CO3(aq) and CaCl2(aq)


48. 2004 Q8 Which of the following pairs of ions would react together to form a white precipitate?

A. Ca2+(aq) and SO42-(aq) B. Cu2+(aq) and NO3-(aq) C. Ni2+(aq) and CO32-(aq) D. NH4+(aq) and OH-(aq)

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The structures of two organic compounds are shown below:

Which of the following statements concerning these two compounds is/are correct?They have the same relative molecular mass.

hey have the same chemical properties. They are both soluble in water.

Which of the following pairs of solutions would from a precipitate when they are mixed?

of the following pairs of ions would react together to form a white precipitate?

Which of the following statements concerning these two compounds is/are correct?

Ans: A

Which of the following pairs of solutions would from a precipitate when they are mixed?

Ans: C

of the following pairs of ions would react together to form a white precipitate?

Ans: A

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49. 2004 Q9 Which of the following methods can be used to obtain water from a mixture of copper powder and

copper(II) sulphate solution? A. distillation B. decantation C. filtration followed by crystallization D. filtration followed by evaporation

Ans: A

50. 2004 Q10 Which of the following combinations concerning the properties of gases is INCORRECT?

Gas Property A. ammonia has an irritating odour B. methane dissolves readily in water C. carbon monoxide can burn in air D. nitrogen monoxide changes from colourless to brown when exposed to air

Ans: B

51. 2004 Q18 Which of the following reagents can be used to distinguish sodium bromide solution from sodium

chloride solution? A. bromine water B. chlorine water C. 1,1,1-trichloroethane D. potassium fluoride solution

Ans: B

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52. 2004 Q28 Ethene can be prepared by heating ethanol with excess concentrated sulphuric acid. The reaction

involved can be represented by the equation:

CH3CH2OH CH2=CH2 + H2Oconc. H2SO4

Which of the set-ups shown below can be used to collect the ethane produced? (1)

(2) (3)


Ans: B

53. 2004 Q32 Which of the following substances can decolourise acidified potassium permanganate solution?

(1) sodium nitrate solution (2) sodium sulphite solution (3) chlorine water


Ans: B

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54. 2004 Q34 Which of the following substances, when dissolved in water, gives a solution with pH greater than 7?

(1) chlorine (2) calcium oxide (3) sulphur dioxide


Ans: B

55. 2005 Q5 When a flame test is performed on copper(II) chloride, what is the colour of the flame observed?

A. golden yellow B. pale purple C. brick-red D. bluish-green

Ans: D 56. 2005 Q26

An aqueous solution of a compound reacts with dilute hydrochloric acid to give a gas. This aqueous solution does not give a precipitate with sodium hydroxide solution. What could the compound be?

(1) potassium sulphite (2) iron(II) sulphate (3) ammonium carbonate


Ans: C

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57. 2005 Q33 When a metal X is warmed with an acid Y, they react to form a colourless solution and a brown gas. Which of the following combinations is correct?

X

Y

A. zinc concentrated nitric acid B. copper concentrated sulphuric acid C. zinc concentrated sulphuric acid D. copper concentrated nitric acid

Ans: A

58. 2006 Q4 Which of following combinations concerning the change of physical state of a substance is INCORRECT?

Change of physical state Process A. liquid to gas evaporation B. liquid to solid precipitation C. solid to gas sublimation D. gas to liquid condensation

Ans: B 59. 2006 Q7

Compound X is soluble in water. Addition of sodium hydroxide solution to a solution of X gives a white precipitate. The precipitate does not dissolve upon the addition of excess alkali. X may be

A. MgCl2. B. ZnCl2. C. FeSO4. D. (NH4)2SO4.

Ans: A 60. 2006 Q16

X is an aqueous solution. When X is added in excess to bromine water, the resulting solution is colourless. When X is treated with dilute hydrochloric acid, a gas with an irritating smell evolves. X may be

A. sodium sulphite solution. B. sodium hypochlorite solution. C. ammonium hydrogencarbonate solution. D. ammonium nitrate solution.

Ans: B

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61. 2006 Q17 Gas X is bubbled into solution Y as shown below:

Which of the following combinations would give no visible change in the test tube?

X

Y

A. sulphur dioxide sodium iodide solution B. ethene acidified potassium permanganate solution C. chlorine litmus solution D. carbon dioxide calcium hydroxide solution

Ans: A

62. 2006 Q35 An athlete is suspected of having taken a prohibited drug. A urine sample of the athlete is therefore collected for analysis. Which of the following methods can be employed to show the possible presence of the drug in the urine sample?

A. centrifugation B. chromatography C. fractional distillation D. volumetric analysis

Ans: B

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63. 2006 Q46 There are two unlabelled bottles in the laboratory. One of the bottles contains an aqueous solution of common salt and the other contains antiseptic alcohol. Which of the following methods can be used to distinguish the substances in the bottles?

(1) adding a small amount of water (2) detecting their odour (3) measuring their electrical conductivity


Ans: C

64. 2007 Q1 Which of the following pairs of aqueous solutions can be distinguished by using dilute hydrochloric acid?

A. zinc iodide and zinc bromide B. silver nitrate and magnesium sulphate C. potassium hydroxide and sodium hydroxide D. sodium carbonate and calcium hydrogencarbonate

Ans: B

65. 2007 Q2 Which of the following substances has a sharp boiling point?

A. petrol B. red wine C. molten wax D. liquid ammonia

Ans: D

66. 2007 Q19 Chlorine is bubbled into an aqueous solution P for some time. The colour of P gradually changes to brown.

P is NOT likely to be

A. calcium hydroxide solution. B. potassium iodide solution. C. iron(II) chloride solution. D. zinc bromide solution.

Ans: A

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67. 2008 Q3 Which of the following ions will NOT react with hot HCl(aq) or hot NaOH(aq)?

A. (aq)Fe2+

B. (aq)NH 4 +

C. (aq)SO 24

D. (aq)SO 23

Ans: C

68. 2008 Q12 Green patches appear on the surface of a metallic statue in a museum. It can be deduced that the statue may

contain A. tin. B. iron. C. silver. D. copper.

Ans: D

69. 2008 Q21 Which of the following substance, when mixed with bromine water, would form a colourless solution? (1) sodium sulphite (2) sodium chloride (3) sodium iodide


Ans: A

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70. 2008 Q26 Consider the following pieces of apparatus :

Which of the following processes can be performed by normal use of some or all of the above apparatus? (1) refluxing a reacting mixture (2) separating two immiscible liquids (3) performing a simple distillation


Ans: B

71. 2008 Q31 Organic compound Q has the following composition by mass : C : 37.5% H : 12.5% O : 50.0%

What is the possible chemical formula of Q? (Relative atomic masses : H = 1.0, C = 12.0, O = 16.0)

A. OHCH3

B. OHHC 52

C. HCOOH

D. COOHCH3

Ans: A

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72. 2008 Q47 The empirical formula of an organic compound T is OCH2 . Effervescence occurs when T is added to sodium

carbonate solution. T may be (1) 3HCOOCH . (2) CH(OH)COOHCH3 . (3) COOHCHCHCH 223 .


Ans: B

73. 2008 Q48 Upon electrolysis, which of the following solutions would give hydrogen at carbon cathode and oxygen at

platinum anode? (1) very dilute sodium chloride solution (2) dilute copper(II) sulphate solution (3) concentrated potassium sulphate solution A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: C

74. 2009 Q7 A colourless aqueous solution of compound Z can conduct electricity and turns blue litmus paper red.

It can be deduced that A. Z must be an ionic compound. B. Z must contain hydrogen in its chemical formula. C. solution of Z must contain more ions than molecules. D. solution of Z must contain more H+ ions than OHions.

Ans: D 75. 2009 Q15 Which of the following statements concerning paper chromatography is correct?

A. The solvent used must be water. B. The solvent used must be an organic solvent. C. It can be used to separate the components of a mixture. D. It can be used to break down a compound into its constituent elements.

Ans: C

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76. 2009 Q23 Which of the following substances can be used to distinguish between magnesium nitrate solution and

silver nitrate solution? (1) zinc strip (2) ammonium nitrate solution (3) potassium chloride solution A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

Ans: B 77. 2009 Q24 Which of the following substances can react with acidified potassium permanganate solution?

(1) propene (2) potassium iodide solution (3) sodium sulphite solution


Ans: D

78. 2009 Q25 Which of the following hazard warning labels should be displayed on the reagent bottle of methanol?

A. (1) and (2) only B. (l) and (3) only C. (2) and (3) only D. (l), (2) and (3)

Ans: A

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79. 2010 Q20 A mixture of (NH4)2SO4(aq) and MgSO4(aq) is heated with excess NaOH(aq). Which of the following

observations is correct ? A. No pungent gas is evolved and no precipitate is formed. B. No pungent gas is evolved but a white precipitate is formed C. A pungent gas is evolved but no precipitate is formed. D. A pungent gas is evolved and a white precipitate is formed.

Ans: D

80. 2010 Q23 The oxide of metal Z reacts with dilute hydrochloric acid to form a colourless solution. Which of the

following metals may Z be? (1) zinc (2) copper (3) silver A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: A

81. 2010 Q42 Which of the following hazard warning labels should be displayed on a bottle of concentrated

hydrochloric acid ?


Ans: A

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82. 2010 Q43 Solution Y is added dropwise to a solution of NaOH containing several drops of phenolphthalein. The

mixture suddenly changes from pink to colourless. Which of the following substances may Y be ? (1) HCl(aq) (2) KCl(aq) (3) Cl2(aq) A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

Ans: C

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NSS Chemistry Part 15 Analytical Chemistry _MC