For a zero order reaction $A \longrightarrow \text{product}$,the concentration of $A$ decreases from $0.8 \ mol \ dm^{-3}$ to $0.2 \ mol \ dm^{-3}$ in $6 \ minute$. What is the rate constant of the reaction?
- A$0.01 \ mol \ dm^{-3} \ minute^{-1}$
- B$1.0 \ mol \ dm^{-3} \ minute^{-1}$
- C$0.1 \ mol \ dm^{-3} \ minute^{-1}$
- D$1.66 \ mol \ dm^{-3} \ minute^{-1}$
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