In any spontaneous process, ?
A. Only F decreases
B. Only A decreases
C. Both F and A decreases
D. Both F and A increase
Thermodynamics for Chemical
The change in Gibbs free energy for vaporisation of a pure substance is___________________?
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?
Answer: Option B 392. Keeg 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___________________?
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______________?
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____________________?
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) ?
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_________________?
With increase in temperature, the atomic heat capacities of all solid elements_________________?
A. Increases
B. Decreases
C. Remains unchanged
D. Decreases linearly
The total change in the enthalpy of a system is independent of the _______________________?
The total change in the enthalpy of a system is independent of the _______________________?
A. Number of intermediate chemical reactions involved
B. Pressure and temperature
C. State of combination and aggregation in the beginning and at the end of the reaction
D. None of these
Which of the following behaves most closely like an ideal gas ?
Which of the following behaves most closely like an ideal gas ?
A. He
B. N2
C. O2
D. H2