MHT CET 2025 Chemistry question

Chemistry Chemical Kinetics MHT CET 2025

A complex reaction takes place in following steps. NO_2Cl_{(g)} \longrightarrow NO_{2(g)} + Cl_{(g)} (slow) NO_2Cl_{(g)} + Cl_{(g)} \longrightarrow NO_{2(g)} + Cl_{2(g)} (fast) Identify rate law equation for this reaction.

(A)r = k []Correct
(B)r = k[] [Cl]
(C)r = k []
(D)r = k []

Answer: (A)

Solution

For a multi-step mechanism the overall rate is governed by the slowest (rate-determining) step. The slow step is NO_2Cl \rightarrow NO_2 + Cl, a unimolecular step whose rate law follows its molecularity: $r =

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Question ID VK-102982