250+ TOP MCQs on Reaction Kinetics Elements – Modelling the Rate Coefficient – 2 and Answers

Chemical Reaction Engineering Questions and Answers for Freshers focuses on “Reaction Kinetics Elements – Modelling the Rate Coefficient – 2”.

1. The reaction rate constant is related to reaction rate as ____
A. k α (-r_A)
B. k α (frac{1}{(-r_A.} )
C. k α e^(-r_A)
D. k is independent of (-r_A)

Answer: A
Explanation: The rate of reaction, (-r_A) = kC_Aⁿ
Where, n is the reaction order. The rate increases as the value of k increases.

2. State true or false.
The Arrhenius law plot of lnk vs 1/ T gives a straight line with large slope for large activation energy.
A. True
B. False

Answer: A
Explanation: The plot of lnk vs 1/ T gives a straight line of slope –(frac{E_a}{(R×T)}). As E_a increases, slope increases.

3. The unit of activation energy is ____
A. mol
B. mol.K
C. K
D. J/ mol

Answer: D
Explanation: Activation energy is expressed in J/ mol or kJ/ mol. Activation energy is the energy required for a chemical reaction to occur.

4. State true or false.
The value of frequency factor affects the temperature sensitivity of reaction.
A. True
B. False

Answer: B
Explanation: Frequency factor in Arrhenius equation does not affect the temperature sensitivity of the reaction. Frequency factor is independent of temperature. It takes the units of rate constant.

5. The rate constant and half life for reactions are related as ____
A. k α t_0.5
B. k α (frac{1}{(t_{0.5})} )
C. k α e^(-t_0.5)
D. k is independent of t_0.5

Answer: B