The concentration of $R$ in the reaction $R \rightarrow P$ was measured as a function of time and the following data is obtained:

$[R]$ (molar) $1.0$ $0.75$ $0.40$ $0.10$
$\mathrm{t}$ (min.) $0.0$ $0.05$ $0.12$ $0.18$

The order of the reaction is

  • [IIT 2010]
  • A

    $1$

  • B

    $0$

  • C

    $2$

  • D

    $3$

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Write differential rate expression of following reaction and give its order of reaction :

$5 B r^{-}+B r O_{3}^-+6 H^{+} \rightarrow 3 B r_{2}+3 H_{2} O$

The reaction $2{N_2}{O_5}$ $\rightleftharpoons$ $2N{O_2} + {O_2}$ follows first order kinetics. Hence, the molecularity of the reaction is

Order of a reaction is decided by

A student has studied the decomposition of a gas $AB _3$ at $25^{\circ} C$. He obtained the following data.

$p ( mm Hg )$ $50$ $100$ $200$ $400$
Relative $t _{1 / 2}( s )$ $4$ $2$ $1$ $0.5$

The order of the reaction is

  • [JEE MAIN 2023]

The order of a reaction is said to be $ 2 $ with respect to a reactant $X, $ when