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(D) The unit of the rate constant $k$ is given by $(mol \ L^{-1})^{1-n} \ s^{-1}$,where $n$ is the order of the reaction.For a zero order reaction $(n

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Decomposition of $HI$ on the surface of gold

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(D) The unit of the rate constant $k$ is given by $(mol \ L^{-1})^{1-n} \ s^{-1}$,where $n$ is the order of the reaction.For a zero order reaction $(n = 0)$,the unit is $(mol \ L^{-1})^{1-0} \ s^{-1} = mol \ L^{-1} \ s^{-1}$.Among the given options,the decomposition of $HI$ on the surface of gold is a zero order reaction because it is a heterogeneous catalytic reaction where the rate is independent of the concentration of the reactant.

In which one of the following reactions,the rate constant has the unit $mol \ L^{-1} \ s^{-1}$?

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