The reaction of formation of phosgene from $CO$ and $Cl_2$ is $CO + Cl_2 \to COCl_2.$ The proposed mechanism is

$(i)$  $C{l_2}\,\underset{{{k_2}}}{\overset{{{k_1}}}{\longleftrightarrow}}\,2Cl$

$(ii)$  $Cl + CO\,\underset{{{k_4}}}{\overset{{{k_3}}}{\longleftrightarrow}}\,COCl$

$(iii)$  $COCl\, + \,C{l_2}\,\,\xrightarrow{{{k_5}}}\,COC{l_2}\, + \,Cl$ (slow)

Find the correct expression of rate law

  • A

    $r = \,{k_5}\, \times \,\frac{{{k_3}}}{{{k_4}}}\, \times \,{\left( {\frac{{{k_1}}}{{{k_2}}}} \right)^{1/2}}[CO]{[C{l_2}]^{3/2}}$

  • B

    $r = \,{k_5}\, \times \,\frac{{{k_3}}}{{{k_4}}}\, \times \,{\left( {\frac{{{k_1}}}{{{k_2}}}} \right)^{1/2}}[CO]{[C{l_2}]^{1/2}}$

  • C

    $r = \,{k_5}\, \times \,{\left( {\frac{{{k_3}}}{{{k_4}}}} \right)^{1/2}}\, \times \,\,\frac{{{k_1}}}{{{k_2}}}\,[CO]{[C{l_2}]^{3/2}}$

  • D

    None of these

Similar Questions

The possible mechanism for the reaction

$2NO + Br \to 2NOBr$ is

$NO + Br_2 \rightleftharpoons NOBr_2$ (Fast)

$NOBr_2 + NO \to 2NOBr$ (Slow)

The rate law expression is

For a chemical reaction $A \to B$ it is found that the rate of reaction doubles, when the concentration of $A$ is increased four times. The order in $A$  for this reaction is

  • [AIIMS 1997]

 $A + B \to $ products, it is found that the rate of the reaction is proportional to the concentration of $A,$  but it is independent of the concentration of $B$, then

If reaction between $A$ and $B$ to give $C$shows first order kinetics in $A$ and second order in $B$, the rate equation can be written as

Assertion : In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients.

Reason : It is the mechanism and not the balanced chemical equation for the overall change that governs the reaction rate.

  • [AIIMS 2009]