CBSE Class 12 Chemical Kinetics Multiple Choice Questions with Answers. MCQ Questions Class 12 Chemical Kinetics with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemical Kinetics MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Chemical Kinetics with Answers - Set - 3
Question 1:
For a reaction taking place in three steps, the rate constants are k1 , k2 and k3 and overall rate constant is k = k1k3 / k2 . If the energies of activation E1, E2 and E3 are 60, 30 and 10 kJ mol-1 , respectively, then the overall energy of activation is
(a) 30 kJ mol-1
(b) 40 kJ mol-1
(c) 60 kJ mol-1
(d) l00 kJ mol-1
Correct Answer – (B)
Question 2 :
A plot of 1/ T versus k for a reaction gives the slope – 1 x 104 K. The energy of activation for the reaction is (Given, R = 8.314K-1 mol-1)
(a) 83.14 J mol-1
(b) 1.202 kJ mol-1
(c) 12.02 J mol-1
(d) 83.14 kJ mo1-1
Correct Answer – (D)
Question 3 :
The reaction A B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B ?
(a) 1 hour
(b) 0.5 hour
(c) 0.25 hour
(d) 2 hours
Correct Answer – (A)
Question 4 :
For a first order reaction A B the reaction rate at reactant concentration of 0.01 M is found to be 2.0 × 10–5 mol L–1 s–1. The half-life period of the reaction is
(a) 30 s
(b) 220 s
(c) 300 s
(d) 347 s
Correct Answer – (D)
Question 5 :
Half-life period of a first order reaction is 1386 seconds. The specific rate constant of the reaction is
(a) 0.5 × 10–2 s–1
(b) 0.5 × 10–3 s–1
(c) 5.0 × 10–2 s–1
(d) 5.0 × 10–3 s–1
Correct Answer – (B)
MCQ Questions Class 12 Chemical Kinetics with Answers
Question 6:
The rate constant (k1 ) of one of the reaction is found to be double that of the rate constant (k2 ) of another reaction. The relationship between the corresponding activation energies of the two reactions Ea1 and Ea2 will be
(a) Ea1 < Ea2
(b) Ea1 > Ea2
(c) Ea1 = Ea2
(d) Ea1 = 2Ea2
Correct Answer – (A)
Question 7:
Raw milk sours in about 4 hat 27°C, but in about 48 h in a refrigerator at 17°C. What is the activation energy for souring of milk?
(a) 78.0 kl mol-1
(b) 46.21 kl mol-1
(c) 23.5 kl mol-1
(d) 80.8 kl mol-1
Correct Answer – (A)
Question 8:
The rate of a first order reaction is 1.5 × 10–2 mol L–1 min–1 at 0.5 M concentration of the reactant. The half-life of the reaction is
(a) 0.383 min
(b) 23.1 min
(c) 8.73 min
(d) 7.53 min
Correct Answer – (B)
Question 9:
If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately (log 4 = 0.60,log 5 = 0.69)
(a) 45 minutes
(b) 60 minutes
(c) 40 minutes
(d) 50 minutes.
Correct Answer – (A)
Question 10:
The half-life of a substance in a certain enzymecatalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L–1 to 0.04 mg L–1 is
(a) 414 s
(b) 552 s
(c) 690 s
(d) 276 s
Correct Answer – (C)
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