NEET Solved Paper 2018 Question 34
Question: The correct difference between first and second order reactions is that [NEET - 2018]
Options:
A) A first-order reaction can catalyzed; a second-order reaction cannot be catalyzed
B) The half-life of a first-order reaction does not depend on $ {{[\text{ A }]}_0} $ ; the half-life of a second-order reaction does depend on $ {{[\text{ A }]}_0} $
C) 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
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.
Show Answer
Answer:
Correct Answer: B
Solution:
For first order reaction, $ {{t} _{1/2}}=\frac{0.693}{k} $ ,
which is independent of initial concentration of reactant.
For second order reaction, $ {{t} _{1/2}}=\frac{1}{k[A _0]} $ ,
which depends on initial concentration of reactant.
