$A$ zero order reaction has a half-life time of $0.2 \ min$. If the initial concentration of the reactant is $0.2 \ mol \ dm^{-3}$,find the rate constant.
- A$0.2 \ mol \ dm^{-3} \ min^{-1}$
- B$0.5 \ mol \ dm^{-3} \ min^{-1}$
- C$1.4 \ mol \ dm^{-3} \ min^{-1}$
- D$6.0 \ mol \ dm^{-3} \ min^{-1}$
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