Problem

A reaction has a rate constant of

0.5 \text{ mol}^{-1} \text{ dm}^3 \text{ min}^{-1}

. If initial concentration of the reactant is

0.2 \text{ mol dm}^{-3}

, half life of the reaction is a. 1.4 min b. 10 min c. 15 min d. 20 min