Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 4 Chemical Kinetics. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry Chemical Kinetics MCQs Pdf with Answers to know their preparation level.
Chemical Kinetics Class 12 Chemistry MCQs Pdf
1. What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?
(a) K
(b) A
(c) Ae
-Ea/Rt
(d) e
-Ea/Rt
Answer
Answer: d
2.
What type of reaction is this?
(a) Second order
(b) Unimolecular
(c) Pseudo-unimolecular
(d) Third order
Answer
Answer: c
3. Which among the following is a false statement?
(a) Rate of zero order reaction is independent of initial concentration of reactant.
(b) Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.
(c) Molecularity of a reaction may be zero or fraction.
(d) For a first order reaction, \(t_{1 / 2}=\frac{0.693}{\mathrm{K}}\)
Answer
Answer: c
4. Which of the following statements about the catalyst is true?
(a) A catalyst accelerates the rate of reaction by bringing down the activation energy.
(b) A catalyst does not participate in reaction mechanism.
(c) A catalyst makes the reaction feasible by making ∆G more negative.
(d) A catalyst makes equilibrium constant more favourable for forward reaction.
Answer
Answer: a
5. An endothermic reaction with high activation energy for the forward reaction is given by the diagram.
Answer
Answer: c
6. For the reaction N
2
+ 3H
2
→ 2NH
3
if \(\frac{\Delta\left[\mathrm{NH}_{3}\right]}{\Delta t}\) = 2 × 10
-4
mol L
-1
s
-1
, the value of \(\frac{-\Delta\left[\mathrm{H}_{2}\right]}{\Delta t}\) would be
(a) 1 × 10
-4
mol L
-1
s
-1
(b) 3 × 10
-4
mol L
-1
s
-1
(c) 4 × 10
-4
mol L
-1
s
-1
(d) 6 × 10
-4
mol L
-1
s
-1
Answer
Answer: b
7. The rate of a certain hypothetical reaction
A + B + C → products
is given by r = \(\frac{-d[\mathbf{A}]}{d t} \mathbf{K}[\mathbf{A}]^{1 / 2}[\mathbf{B}]^{1 / 3}[\mathbf{C}]^{1 / 4}\). The order of the reaction is
(a) 13/11
(b) 13/14
(c) 12/13
(d) 13/12
Answer
Answer: d
8. In the formation of S02 by contact process;
2SO
2
+ O
2
→ 2SO
3
, the rate of reaction was measured as \(\frac{-d\left[\mathrm{O}_{2}\right]}{d t}\) = 2.5 × 10
-4
mol L
-1
s
-1
. at
The rate of formation of of S03 will be
(a) -5.0 × 10
-4
mol L
-1
s
-1
(b) -1.25 × 10
-4
mol L
-1
s
-1
(c) 3.75 × 10
-4
mol L
-1
s
-1
(d) 5.00 × 10
-4
mol L
-1
s
-1
Answer
Answer: d
9. For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is
(a) Two
(b) One
(c) Half
(d) Zero
Answer
Answer: c
10. The half life of the first order reaction having rate constant K = 1.7 x 10
-5
s
-1
is
(a) 12.1 h
(b) 9.7 h
(c) 11.3 h
(d) 1.8 h
Answer
Answer: c
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