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# Previous Year Questions (2014-20) - Chemical Kinetics Class 12 Notes | EduRev

## NEET : Previous Year Questions (2014-20) - Chemical Kinetics Class 12 Notes | EduRev

The document Previous Year Questions (2014-20) - Chemical Kinetics Class 12 Notes | EduRev is a part of the NEET Course Chemistry Class 12.
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Q.1. The rate constant for a first order reaction is 4.606 × 10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is:     (2020)
A: 500 s
B: 1000 s
C: 100 s
D: 200 s
Ans:
A

Q.2. If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:    (2019)
A: t = 0.693/k
B: t = 6.909/k
C: t = 4.606/k
D: t = 2.303/k
Ans:
C
First order rate constant is given as,

99% completed reaction,

Q.3. For the chemical reaction

The correct option is:    (2019)
A:
B:
C:
D:
Ans:
C

Rate of reaction is given as

Q.4. When initial concentration of the reactant is doubled,the half-life period of a zero order reaction    (2018)
A: is halved
B: is doubled
C: is tripled
D: remains unchanged
Ans:
B

Q.5. The correct difference between first- and second-order reaction is that    (2018)
A: the rate of a first-order reaction does not depend on reactant concentration; the rate of a second order reaction does depend on reactant concentrations.
B: the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0
C: a first-order reaction can be catalyzed;a second-order reaction cannot be catalyzed.
D: the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
Ans:
B

Q.6. Mechanism of a hypothetical reaction    (2017)

A: 2
B: 0
C: 1.5
D: 1
Ans: C

Q.7. A first order reaction has a specific reaction rate of 10–2 sec–1. How much time will it take for 20g of the reactant to reduce to 5 g ?    (2017)
A: 138.6 sec
B: 346.5 sec
C: 693.0 sec

D: 238.6 sec
Ans:
A

Q.8. The rate of a first-order reaction is 0.04 mol ℓ-1 s-1 at 10 seconds and 0.03 mol ℓ-1 s-1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is :    (2016)
A: 54.1 s
B: 24.1 s
C: 34.1 s
D: 44.1 s
Ans:
B

Q.9. The activation energy of a reaction can be determined from the slope of which of the following graphs ?    (2015)
A:
B: ln K vs. T
C:
D:
Ans:
D

Q.10. When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is :    (2015)
A: More than zero but less than first
B: Zero
C: First
D: Second
Ans:
C

For first order reaction, half-life period is not depends upon initial concentration.

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## Chemistry Class 12

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