SATHEE: Chemical Kinetics - Result Question 4

Chemical Kinetics - Result Question 4

####4. The correct difference between first and second order reactions is that

[2018]

(a) The rate of a first-order reaction does not depend on reactant concentrations, 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) 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

(d) A first-order reaction can be catalyzed, a second-order reaction cannot be catalyzed

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Solution:

(b) $(t_{1 / 2}) 1^{st}$ order $=$ Independent of concentration $(t_{1 / 2}) 2^{nd}$ order $\propto \frac{1}{[A]_{0}}$

Half life for the second order reaction is

$t_{1 / 2} = \frac{1}{K \times [A]_{0}}$

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Chemical Kinetics - Result Question 4

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