250+ TOP MCQs on Temperature & Pressure Effects – Equilibrium Conversion and Answers

Chemical Reaction Engineering Multiple Choice Questions & Answers on “Temperature & Pressure Effects – Equilibrium Conversion”.

1. State true or false.
It is possible to achieve a conversion greater than the equilibrium conversion.
A. True
B. False
View Answer

Answer: B
Explanation: Equilibrium conversion is the maximum value of conversion that can be achieved in any system. Conversion above the equilibrium value of conversion is not possible.

2. State true or false.
A reversible reaction is the one in which the reaction proceeds simultaneously in both directions.
A. True
B. False
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Answer: A
Explanation: A reversible reaction occurs simultaneously and independently in both directions. It is represented in the general form A ↔ R.

3. For the reaction A ↔ R, which of the following is the correct expression of C_R?
A. C_R = C_A0X_A
B. C_R = C_A0X_A
C. C_R = C_R0 + C_A0
D. C_R = C_R0 + C_A0X_A
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Answer: D
Explanation: The final concentration of R is given as C_R= C_R0 + C_A0X_A. C_A0X_A is the amount of A converted to R, which is the amount of R formed.

4. Equilibrium is a state in which ___
A. Rate of forward reaction > Rate of backward reaction
B. Rate of forward reaction = Rate of backward reaction
C. Rate of forward reaction < Rate of backward reaction
D. Rate of forward reaction is independent of the rate of backward reaction
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Answer: B
Explanation: At equilibrium, the net rate of reaction is zero. The rate of change of concentration of A is zero.

5. For the reaction A ↔ R, k₁ being the rate constant of forward reaction, k₂ being the rate constant of backward reaction and X_Ae is the equilibrium conversion, k₂ is obtained as _____
A. k₂ = k₁(frac{(1 – X_{Ae})}{(frac{C_{A0}}{C_{R0}} + X_{Ae})} )
B. k₂ = k₁(frac{(1 + X_{Ae})}{(frac{C_{A0}}{C_{R0}} + X_{Ae})} )
C. k₂ = k₁(frac{(1 – X_{Ae})}{(frac{C_{A0}}{C_{R0}} – X_{Ae})} )
D. k₂ = k₁(frac{(1 – X_{Ae})}{(frac{C_{A0}}{C_{R0}} – X_{Ae})} )
View Answer

Answer: A
Explanation: At equilibrium, rate is zero. Hence, k₂((frac{C_{A0}}{C_{R0}}) + X_Ae) – k₁(1- X_Ae) = 0. k₂ = k₁(frac{(1 – X_{Ae})}{(frac{C_{A0}}{C_{R0}} + X_{Ae})}. )

7. Which of the following represents second order bimolecular type reversible reaction?
A. A+B ↔ R+S
B. A ↔ B
C. A ↔ R+S
D. A+B ↔ R
View Answer

Answer: A
Explanation: Bimolecular reaction involves 2 molecules. Both reactants and products react simultaneously.

8. The plot of the function of equilibrium conversion to time for a bimolecular type reversible reaction is ____
A. Exponential
B. Linear
C. Logarithmic
D. Quadratic
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Answer: B
Explanation: The kinetics is represented as, ln((frac{X_{Ae}-2(X_{Ae}-1)X_A}{X_{Ae}-X_A})) = 2k₁((frac{1}{X_{Ae}}-1))C_A0t. This represents the equation of a straight line.

9. Which of the following is not a reversible reaction?
A. Ammonia formation from its elements
B. Formation of hydrogen bromide from its elements
C. Decomposition reaction of nitrogen pentoxide
D. Oxidation of sulphur dioxide to sulphur trioxide
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Answer: B
Explanation: The reaction of hydrogen with bromine is irreversible reaction. H₂ + Br₂ → HBr.

10. The Le- Chatlier principle states that ____
A. No reaction is reversible
B. All reactions are reversible at high temperatures
C. A system experiencing disturbance shifts direction of equilibrium to nullify the change
D. A system experiencing disturbance does not shift direction of equilibrium to nullify the change
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Answer: