Chemical Engineering Thermodynamics Important Questions - Set 24 - ObjectiveBooks

# Practice Test: Question Set - 24

1. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as
(A) Solubility increases as temperature increases
(B) Solubility increases as temperature decreases
(C) Solubility is independent of temperature
(D) Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution

2. If atmospheric temperature and dew point are nearly equal, then the relative humidity is
(A) Zero
(B) 50%
(C) Almost 100%
(D) Unpredictable

3. Consider the reaction, C + O2  CO2; Î”H = - 94 kcal. What will be the value of Î”H for the reaction CO2 → C + O2?
(A) -94 kcal
(B) +94 kcal
(C) > 94 kcal
(D) < -94 kcal

4. No work is done by the system, when a reaction occurs at constant
(A) Volume
(B) Temperature
(C) Pressure
(D) None of these

5. Gibbs free energy at constant pressure and temperature under equilibrium conditions is
(A) ∞
(B) 0
(C) Maximum
(D) Minimum

6. Joule-Thomson Co-efficient at any point on the inversion curve is
(A)
(B) +ve
(C) 0
(D) -ve

7. The ammonia synthesis reaction represented by N2 + 3H2  2NH3; Î”H = - 22.4 kcal, is
(A) Endothermic
(B) Exothermic
(C) Isothermal

8. At absolute zero temperature, the __________ of the gas is zero.
(A) Pressure
(B) Volume
(C) Mass
(D) None of these

9. In a reversible chemical reaction (where, Î”x = number of moles of products-number of moles of reactants)
(A) Addition of inert gas favors the forward reaction, when Î”x is positive
(B) Pressure has no effect on equilibrium, when Î”n = 0
(C) Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Î”x (+ ve, - ve) or zero)
(D) All 'a', 'b' & 'c'

10. For a constant volume process
(A) dE CpdT
(B) dE CvdT
(C) dQ = dE + pdV
(D) dW pdV

11. The quantitative effect of temperature on chemical equilibrium is given by the
(A) Van’t-Hoff equation
(B) Le-Chatelier's principle
(C) Arrhenius equation
(D) None of these

12. Entropy change in case of reversible adiabatic process is
(A) Minimum
(B) Zero
(C) Maximum
(D) Indeterminate

13. Which is a state function?
(A) Specific volume
(B) Work
(C) Pressure
(D) Temperature

14. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
(A) Zeroth
(B) First
(C) Second
(D) Third

15. Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.
(A) Infinity
(B) Minus infinity
(C) Zero
(D) None of these

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