Question

The half-life period is independent of the initial concentration of reactant when the reaction is:

• A. first order
• B. second order
• C. zero order
  
• D. pseudo first order

Answer 1

Answer: (A)

first order

Half-life Method

Relation between half-life period of a reaction and intial concentration is as follows : $t^{1/2}\propto \frac{1}{a^{n-1}}$

For first order reaction (Half life $\propto a^0)$

For second order reaction (Half life $1/a)$

For third order reaction (Half life $\propto 1/a^2)$