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  4. When plotted a graph of concentration longrightarrow time for zero order reaction, then the value of slope is

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Q. When plotted a graph of concentration $\longrightarrow $ time for zero order reaction, then the value of slope is

Gujarat CETGujarat CET 2008Chemical Kinetics

Solution:

Expression for rate constant for zero order reaction is
$ k = \frac{1}{t} ([A]_0 - [A]) $
$\Rightarrow kt = [A]_0 - [A]$
$\Rightarrow [A] = -kt + [A]_0$
It is an equation of straight line [ y = mx + c ], the plot of [A] versus twill be a straight line with slope = -k and intercept on the concentration axis = $[A]_o$

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