Which of the following is correct ?

  • A

    molecularity of a reaction can be fractional

  • B

    Zero order reaction never stops

  • C

    A first order reaction must be homogeneous

  • D

    The rate constant of a reaction becomes equal to the pre-exponential factor when the absolute temperature is infinity

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

Inversion of sucrose is

The rate constant for the reaction, $2{N_2}{O_5} \to 4N{O_2}$ $ + {O_2}$ is $3 \times {10^{ - 5}}{\sec ^{ - 1}}$. If the rate is $2.40 \times {10^{ - 5}}\,mol\,\,litr{e^{{\rm{ - 1}}}}{\sec ^{ - 1}}$. Then the concentration of ${N_2}{O_5}$ (in mol litre $^{-1}$) is

  • [IIT 2000]

For a certain reaction, $10\%$ of the reactant dissociates in $1\, hour$, $20\%$ of the reactant dissociate in $2\, hour$, $30\%$ of the reactant dissociates in $3\, hour$. Then the units of rate constant is