250+ TOP MCQs on Enthalpy – I and Answers

Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Enthalpy – I”.

1. Enthalpy (H) is
a) H = U + PV
b) H = U – PV
c) H = U*PV
d) None of the mentioned
Where: U-Internal energy, P- Pressure, V- Volume
Answer: a
Clarification: H = U + PV.

2. Specific enthalpy is the function of
a) Temperature and Pressure
b) Temperature and Volume
c) Pressure and Volume
d) None of the mentioned
Answer: a
Clarification: H = f(T, P).

3. Cp is the change in enthalpy with respect to temperature at constant _____________
a) Pressure
b) Volume
c) Temperature
d) None of the mentioned
Answer: a
Clarification: Cp is the change in enthalpy with respect to temperature at constant Pressure.

4. For ideal gases, Enthalpy and Internal energy is only the function of __________
a) Pressure
b) Volume
c) Temperature
d) None of the mentioned
Answer: c
Clarification: For ideal gases, Enthalpy and Internal energy is only the function of Temperature.

5. Enthalpy has no absolute value. Only changes can be calculated.
The given statement is
a) Correct
b) Incorrect
c) Always incorrect
d) None of the mentioned
Answer: a
Clarification: Enthalpy is calculated with respect to a reference, there is no absolute value.

6. For ideal gases, the heat capacity relation is
a) Cp = Cv – R
b) Cv = Cp + R
c) Cp – Cv = R
d) None of the mentioned
Answer: c
Clarification: Cp – Cv = R.

7-10. For the given figure

7. What is T1?
a) T, melting
b) T, freezing
c) T, vaporization
d) T, condensation