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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