In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc:
A. 2HI ⇌ H2 + I2
B. N2O4 ⇌ 2NO2
C. 2SO2 + O2 ⇌ 2SO3
D. None of these
The partial pressure of each constituent present in an alloy is ___ the total vapor pressure exerted by the alloy:
A. Less than
B. Equal to
C. More than
D. Either B. or C; depends on the type of alloy
In any spontaneous process:
A. Only F decreases
B. Only A decreases
C. Both F and A decreases
D. Both F and A increase
The change in Gibbs free energy for vaporisation of a pure substance is:
A. Positive
B. Negative
C. Zero
D. May be positive or negative
Answer: Option B 392. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to _____ °C:
A. 270
B. 327
C. 300
D. 540
Free energy:
A. Decreases in all spontaneous (or irreversible) processes
B. Change during a spontaneous process has a negative value
C. Remains unchanged in reversible processes carried at constant temperature and pressure
D. All A, B. and C
Degrees of freedom at triple point will be:
A. 0
B. 1
C. 2
D. 3
For an irreversible process involving only pressure-volume work:
A. (dF)T, p <0
B. (dF)T, p = 0
C. (dF)T, p > 0
D. (dA)T, v >0
Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance):
A. Air cycle
B. Carnot cycle
C. Ordinary vapour compression cycle
D. Vapour compression with a reversible expansion engine
With increase in temperature, the atomic heat capacities of all solid elements:
A. Increases
B. Decreases
C. Remains unchanged
D. Decreases linearly
