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NEET 2007
Exam
NEET
Year
2007
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2007 · Chemistry · Chemical Kinetics

The reaction of hydrogen and iodine monochloride is given as: H_...

The reaction of hydrogen and iodine monochloride is given as: H2(g)+2ICl(g)→2HCl(g)+\mathrm{H}_{2(g)}+2 \mathrm{ICl}_{(g)} \rightarrow 2 \mathrm{HCl}_{(g)}+\mathrm{I}2(g)_{2(g)} This reaction is of first order with respect to H2(g)andlCl(g)+\mathrm{H}_{2(g)} and \mathrm{lCl}_{(g)+} following mechanisms were proposed Mechanism A: H2(g)+2ICl(g)→2HCl(g)+H2(g)\mathrm{H}_{2(g)}+2 \mathrm{ICl}_{(g)} \rightarrow 2 \mathrm{HCl}_{(g)}+\mathrm{H}_{2(g)} Mechanism B: H2(g)+ICl(g)→HCl(g)+HI(g) :slow Hl(g)+lCl(g)→HCl(g)+l2(g); fast \begin{aligned} & \mathrm{H}_{2(g)}+\mathrm{ICl}_{(g)} \rightarrow \mathrm{HCl}_{(g)}+\mathrm{HI}_{(g)} \text{ :slow } \\ & \mathrm{Hl}_{(g)}+\mathrm{lCl}_{(g)} \rightarrow \mathrm{HCl}_{(g)}+\mathrm{l}_{2(g)} \text{; fast } \end{aligned} Which of the above mechanism(s) can be consistent with the given information about the reaction?

Options

  1. AA and B both
  2. Bneither A nor B
  3. CA only
  4. DB only

Correct answer

A. A and B both

Step-by-step solution

The slowest step is the rate determining step thus the mechanism B\mathrm{B} will be more consistent because it involve one molecule of H2andonemoleculeofICl.Itcanbeexpressedas\mathrm{H}_2 and one molecule of ICl. It can be expressed asr=k[H2][ICl]\left[\mathrm{H}_2\right][\mathrm{ICl}] Related Theory The rate determining step in a reaction mechanism is characterised by high activation energy. Usually, the first step is the slow step since it has the highest activation energy.
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