For the decomposition of $\mathrm{HI}$at $1000 \mathrm{K} \left(2\mathrm{HI}\to {\mathrm{H}}_2+{\mathrm{I}}_2\right)$, the following data were obtained:

$\left[\mathrm{HI}\right] \mathrm{M}$	Rate of decomposition of $\mathrm{HI} \left(\mathrm{mol} {\mathrm{L}}^{-1} {\mathrm{s}}^{-1}\right)$
$0.1$	$2.75\times {10}^{-8}$
$0.2$	$11\times {10}^{-8}$
$0.3$	$24.75\times {10}^{-8}$

The order of the reaction is.

For the reaction $\mathrm{A}\to \mathrm{B}+\mathrm{C}$, the energy profile diagram is given in the figure:

What is the decrease in energy of activation in presence of catalyst?

Assertion: The rate law of a reaction cannot be predicted from its balanced chemical equation, but must be determined experimentally only.

Reason: The order of a reaction is always an integer like $0, 1, 2$and $3$.

[TS EAMCET (med.) 2015]

Which one of the following statement is not correct for the order of the reaction?

[IIT JEE 2005; CBSE PMT (Prelims) 2011]