Na2S2O3 reacts with moist Cl2 to form Na2SO4, HCl and X. Which on

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The pKvalues of four carboxylic acids are given below. Identify the weakest carboxylic acid.

  • 4.89

  • 1.28

  • 4.76

  • 2.56


12.

Which one of the following is an example of disproportionation reaction?

  • 3Cl2 (g) + 6OH- (aq) → ClO3- (aq) + 5Cl- (aq) + 3H2O (l)

  • Ag2+ (aq) + Ag (s) → 2Ag+ (aq)

  • Zn (s) + CuSO4 (aq) → Cu (s) + ZnSO4 (aq)

  • 2KClO3 (s) → 2KCl (s) + 3O2 (g)


13.

Observe the following statements-

i. Heavy water is harmful for the growth of animals.

ii. Haevy water reacts with Al4C3 and forms deyterated acetylene. 

iii. BaCl2.2D2O is an example of interstitial deuterate.

The correct statements are-

  • 1 and 3

  • 1 and 2

  • 1, 2 and 3

  • 2 and 3


14.

Diborane reacts with HCl in the presence of AlCl3 and liberates

  • H2

  • Cl2

  • BCl3

  • Cl2 and BCl3


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15.

How many corners of SiO4 units are shared in the formation of three dimensional silicates?

  • 3

  • 2

  • 4

  • 1


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16.

Na2S2O3 reacts with moist Cl2 to form Na2SO4, HCl and X. Which one of the following is X?

  • H2S

  • SO2

  • SO3

  • S


D.

S

Sodium thiosulphate is oxidised by moist Cl2 or chlorine water and precipitates sulphur.

Na2S2O3 + Cl2 + H2O → Na2SO4 + 2HCl + S


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17.

Cataract and skin cancer are caused by

  • depletion of nitric oxide

  • depletion of ozone layer

  • increase in methane

  • depletion of nitrous oxide


18.

C2H6 450°C C2H4 + H2

Above reaction is known as

  • combustion

  • rearrangement

  • pyrolysis

  • cleavage


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19.

Assertion (A) : NH2 group of aniline is ortho, para directing in electrophilic substitutions.

Reason (R) : -NH2 group stabilises the arenium ion formed by the ortho, para attack of the electrophile.

The correct answer is

  • Both (A) and (R) are correct, (R) is the correct explanation of (A).

  • Both (A) and (R) are correct, (R) is not the correct explanation of (A).

  • (A) is correct, but (R) is not correct.

  • (A) is not correct, but (R) is correct.


20.

In which of the following properties, the two enantiomers of lactic acid differ from each other?

  • Sign of specific rotation

  • Density

  • Melting point

  • Refractive index


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