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21) The work done in joule for the reversible expansion of 1 mole of an
ideal gas from a volume of 10 lit to 20 lit at 25°C is:
a) -298 x 2.303 x 8.31 x log2.
b) -2.303 x 298 x 0.082 log 0.5.
c) -2.303 x 298 x 82 log 2.
d) -2.303 x 298 x 2 log2.
ANSWER : -298 x 2.303 x 8.31 x log2.
22) The enthalpy of formation of ammonia is -46.0 kJ mol-1. The
enthalpy for the reaction 2 N2 + 6 H2 -> 4 NH3
is equal to:
a) -184.0 kJ.
b) 184.0 kJ.
c) -92.0 kJ.
d) 92.0 kJ.
ANSWER : -184.0 kJ.
23) The heat for neutralization of HCL with NaOH is – 47.21 kJ per gm equi.
What will be the heat evolved during neutralization of CH3COOH with NaOH.
a) = 47.21 kJ.
b) < 47.21 kJ.
c) > 47.21 kJ.
d) Equal to the heat of reaction.
ANSWER : < 47.21 kJ.
24) Equal volumes of molar hydrochloric acid and sulphuric acid are
neutralized by dil. NaOH solution and a kJ and b kJ of heat are liberated
respectively which among the following is true?
a) a = b.
b) a = ½ b.
c) b = 3/2 a.
d) a = 2 b.
ANSWER : a = ½ b.
25) The work done in a chemical reaction is – 250J if the system absorbs
500J of heat, then what will be the change in internal energy?
a) -250J.
b) -750J.
c) +750J.
d) +250J.
ANSWER : +250J.
26) Heat of formation of CH4 is – 74.89 kJ. Heat of combustion of
C and CH4 are -393.71 and – 890.36 kJ respectively. What is the heat
of combustion of H2?
a) -285.77 kJ.
b) +285.77 kJ.
c) +1955.57 kJ.
d) -1955.57 kJ.
ANSWER : -285.77 kJ.
27) In the combustion of 1 mole of CO – 400 kJ of heat is liberated. The
heat of combustion of 7g of CO is:
a) -100 kJ.
b) 100 kJ.
c) – 200 kJ.
d) 200 kJ.
ANSWER : -100 kJ.
28) Maximum work is obtained in:
a) Irreversible process.
b) Adiabatic process.
c) Irreversible isothermal process.
d) Reversible isothermal process.
ANSWER : Reversible isothermal process.
29) For a given reaction 2CO + O2 -> 2 CO2 ?H
is -85600 cals at 300K, then ?E will be. ( if R = 2 cal).
a) +84400 cals.
b) -84400 cals.
c) 85000 cals.
d) -85000 cals.
ANSWER : 85000 cals.
30) Which one of the following has the highest heat of neutralisation?
a) Strong acid + strong base.
b) Weak acid + weak base.
c) Strong acid + weak base.
d) Weak acid + strong base.
ANSWER : Strong acid + strong base.
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