For a general reaction $A \to B$, plot of concentration of $A$ vs time is given in figure. Answer the following question on the basis of this graph.

$(i)$ What is the order of the reaction ?

$(ii)$ What is the slope of the curve ?

$(iii)$ What are the units of rate constant ?

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$(i)$ Zero order reaction.

For zero order reaction

$[\mathrm{R}]=-k(t)+[\mathrm{R}]_{0}$

$\uparrow$

$y=m$ $\begin{array}{lll}\uparrow & \uparrow & \uparrow \\ x & + & c\end{array}$

So, the graph is of straight line.

$(ii)$ Slope $=-k$

$(iii)$ Unit of zero order reaction is $\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}$.

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