11
The rate of evaporation of a liquid is always faster at a higher temperature because
A)
the enthalpy of vaporization is always endothermic
B)
the enthalpy of vaporization is always exothermic
C)
the enthalpy of vaporization is zero
D)
the internal pressure of the liquid is less than that of the gas
Answer & Solution
Answer: Option
A
12
Choose the correct criterion of spontaneity in terms of the properties of the system alone.
A)
(dS)U,V > 0
B)
(dS)T,p > 0
C)
(dS)H,p < 0
D)
(dS)T,V < 0
Answer & Solution
Answer: Option
A
13
The criterion for the spontaneity of a process is
A)
ΔSsys > 0
B)
ΔSsurr > 0
C)
ΔSsys + ΔSsurr > 0
D)
ΔSsys - ΔSsurr > 0
Answer & Solution
Answer: Option
C
14
The molar entropy of crystalline CO at absolute zero is
A)
zero
B)
-R In2
C)
R In2
D)
2R In2
Answer & Solution
Answer: Option
C
15
$${\left( {\frac{{\partial G}}{{\partial p}}} \right)_T} = $$
A)
V
B)
S
C)
-S
D)
-V
Answer & Solution
Answer: Option
A
16
Among the following, the system that would require the least amount of thermal energy to bring its temperature to 80°C is
A)
200 g of water at 40°C
B)
100 g of water at 20°C
C)
150 g of water at 50°C
D)
300 g of water at 30°C
Answer & Solution
Answer: Option
C
17
Among the following, the reaction that is accompanied by a decrease in the entropy is
A)
N2 (g) + 3H2 (g) → 2NH3 (g)
B)
C6 H12 O6 (s) + 6O2 (g) → 6CO2 (g) + 6H2 O($$l$$)
C)
PCl5 (s) → PCl3 ($$l$$) + Cl2 (g)
D)
2H2 O($$l$$) → 2H2 (g) + O2 (g)
Answer & Solution
Answer: Option
A
18
The criterion for spontaneous change in terms of the state functions is
A)
dUS,V ≥ 0
B)
dAT,V ≥ 0
C)
dSU,V ≥ 0
D)
dGp,V ≤ 0
Answer & Solution
Answer: Option
D
19
The free energy change (ΔG) of 1 mole of an ideal gas that is compressed isothermally from 1 atm to 2 atm is
A)
RT In2
B)
-2RT
C)
-RT ln2
D)
2RT
Answer & Solution
Answer: Option
A
20
Among W (work), Q (heat), U (internal energy) and S (entropy)
A)
W and U are path functions but Q and S are state functions
B)
W and S are path functions but Q and U are state functions
C)
S and U are path functions but Q and W are state functions
D)
W and Q are path functions but U and S are state functions
Answer & Solution
Answer: Option
D
