In a reaction with initially `0.12 M`, the concentration of reactant is reduced to `0.06 M` in `10` hour and to `0.03 M` in `20` hour.
(i) What is order of reaction?
(ii) What is rate constant?
(b) The rate of a first order reaction is `0.04 mol litre^(-1) s^(-1)` at `10` minute and `0.30 mol litre^(-1)` at `20` minute after initiation. Find the half-life of the reaction.

Explanation

To solve the given problem step by step, we will analyze the data provided and apply the relevant equations for chemical kinetics.

### Step 1: Determine the order of the reaction

Given:
- Initial concentration, [A]₀ = 0.12 M
- Concentration after 10 hours, [A]₁ = 0.06 M
- Concentration after 20 hours, [A]₂ = 0.03 M
...