MCQs Chemistry

1: Fructose reduces Tollen’s reagent due to

A: Asymmetric carbons

B: Primary alcoholic group

C: Secondary alcoholic group

D: Enoiisation of fructose followed conversion to aldehyde by base

Correct Answer: D

2: The half life of 6C14, if itsis 2.31 ×10-4 , is

A: 2 × 102 yrs

B: 3.5 × 104 yrs

C: 3 × 103 yrs

D: 4 × 103 yrs

Correct Answer: C

3: In an endothermic reaction , the value of change in enthalpy () is

A: positive

B: negative

C: zero

D: either (b) or (c)

Correct Answer: A

4: At STP, the dencity of a gas (molecular weight 45) is

A: 2 g/litre

B: 22.4 g/litre

C: 11.2 g/litre

D: 26.6 g/litre

Correct Answer: A

5: A certain sample of gas has a volume of 0.2 litres measured at 1 atm . pressure and 0º C .at the same pressure but at 273ºC , its volume will be

A: 0.4 litre

B: 1.4 litre

C: 0.8 litre

D: 1.8 litre

Correct Answer: A

6: If the equivalent weight of a bivalent metal is 37.2 then the molecular weight of its chloride is

A: 108.2

B: 216.6

C: 145.4

D: 412.2

Correct Answer: C

7: The e.m.f. of a galvanic cell , with electrode potentials of zinc = + 0.76 V and that of copper = - 0.34 V , is

A: -1.1 V

B: +0.34 V

C: +1.1 V

D: +0.76 V

Correct Answer: C

8: Most favourable conditional for iopnic bonding are

A: low charge on ions, large cation, large anion

B: low charge on ions, large cation, small anion

C: high charge on ions , large cations , small anion

D: high charge on ions , large cations , large anion

Correct Answer: B

9: Sulphur -35 (34.96903 a.m.u. ) emits a β- particles but no γ- ray. The product is chlorine -35 (34.96885 a.m.u.) The maximum energy emitted by the β- particles is

A: 16.758 MeV

B: 0.16758 MeV

C: 1.6758 MeV

D: 0.016767 MeV

Correct Answer: B

10: Gibbs free energy , for the reaction at equilibrium , is

A: aero

B: - ve

C: + ve

D: either (b) or (c)

Correct Answer: A

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