Question

When plotted a graph of concentration $⟶$ time for zero order reaction, then the value of slope is

• A. $-\frac{k}{2.303}$
• B. -2.303 xk
• C. -k
• D. $-\frac{E_a}{2.303R}$

Answer 1

Answer: (C)

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 = $[A{]}_o$