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MCQ Questions Class 12 Chemical Kinetics with Answers - Set - 5
Question 1:
The rate of the reaction,
2NO + Cl2 → 2NOCl is given by the rate equation, rate = k[NO]2[Cl2]. The value of the rate constant can be increased by
(a) increasing the temperature
(b) increasing the concentration of NO
(c) increasing the concentration of the Cl2
(d) doing all of these.
Correct Answer – (A)
Question 2 :
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20 °C to 35 °C? (R = 8.314 J mol–1 K–1)
(a) 34.7 kJ mol–1
(b) 15.1 kJ mol–1
(c) 342 kJ mol–1
(d) 269 kJ mol–1
Correct Answer – (A)
Question 3 :
For a reaction, activation energy Ea = 0 and the rate constant at 200 K is 1.6 × 106 s–1. The rate constant at 400 K will be [Given that gas constant R = 8.314 J K–1 mol–1]
(a) 3.2 × 104 s–1
(b) 1.6 × 106 s–1
(c) 1.6 × 103 s–1
(d) 3.2 × 106 s–1
Correct Answer – (B)
Question 4 :
If Xis the total number of collisions which a gas molecule register with others per unit time under particular conditions, then the collision frequency of the gas containing N molecules per unit volume is
(a) X / N
(b) NX
(c) 2 NX
(d) NX / 2
Correct Answer – (D)
Question 5 :
he activation energies of two reactions are E1 and E2 (E1 > E ). If the temperature of the system is increased from T1 to T2 , the rate constant of the reactions changes from k1 to k2 in the first reaction and k2 to k2 in the second reaction. Preruct which of the following expression is correct ?
(a) k1 / k1 = k2 / k2
(b) k1 / k1 > k2 / k2
(c) k1 / k1 < k2 / k2
(d) k1 / k1 = k2 / k2 = 1
Correct Answer – (B)
MCQ Questions Class 12 Chemical Kinetics with Answers
Question 6:
In a zero-order reaction, for every 10 °C rise of temperature, the rate is doubled. If the temperature is increased from 10 °C to 100 °C, the rate of the reaction will become
(a) 256 times
(b) 512 times
(c) 64 times
(d) 128 times.
Correct Answer – (B)
Question 7:
The addition of a catalyst during a chemical reaction alters which of the following quantities?
(a) Enthalpy
(b) Activation energy
(c) Entropy
(d) Internal energy
Correct Answer – (B)
Question 8:
For a first-order reaction, the half-life period is independent of
(a) first power of final concentration
(b) cube root of initial concentration
(c) initial concentration
(d) square root of final concentration.
Correct Answer – (C)
Question 9:
Which of the following statement is in accordance with collision theory ?
I. Rate is directly proportional to collision frequency
II. Rate depends upon orientation of atoms
III. Temperature determines the rate
(a) Only III
(b) Only I and II
(c) Only II and III
(d) All of these
Correct Answer – (D)
Question 10:
For a first order reaction A ➔ P, the temperature (T) dependent rate constant ( k) was found to follow the equation log k = – (2000)/ T + 6.0 The pre-exponential factor A and the actjvation energy Ea, respectively, are
(a) 1.0 x 106s-1 and 9.2 kJ mol-1
(b) 6.0s-1 and 16.6 kJ mol-1
(c) 1.0 x 106s-1 and 16.6 kJ mol-1
(d) 1.0 x 106s-1 and 38.3 kJ mol-1
Correct Answer – (D)
- NCERT Solutions Class 11 Chemistry Chapter 1 : Some Basic Concepts of Chemistry
- NCERT Solutions Class 11 Chemistry Chapter 2 : Structure Of The Atom
- NCERT Solutions Class 11 Chemistry Chapter 3 : Classification of Elements and Periodicity in Properties
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