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(C) The general formula for the units of the rate constant $k$ for a reaction of order $n$ is given by $(mol \ L^{-1})^{1-n} \ s^{-1}$.Since $1 \ L^{-

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(C) The general formula for the units of the rate constant $k$ for a reaction of order $n$ is given by $(mol \ L^{-1})^{1-n} \ s^{-1}$.Since $1 \ L^{-1} = 1 \ dm^{-3}$,the unit can be written as $(mol \ dm^{-3})^{1-n} \ s^{-1}$.We are given the unit as $mol \ dm^{-3} \ s^{-1}$,which is equivalent to $(mol \ dm^{-3})^{1} \ s^{-1}$.Comparing the exponents of $(mol \ dm^{-3})$,we get $1-n = 1$,which implies $n = 0$.Therefore,the reaction is a zero-order reaction.

Time $(s)$	Concentration of the reactant $(mol \ L^{-1})$
$0$	$0.1$
$15$	$0.05$
$20$	$0.1 - x$

The order of reaction for which the units of rate constant are $mol \ dm^{-3} \ s^{-1}$ is

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