Verified Solution • 2025–26 Session moderate

QAIPMT-2007-Ch-2287: NEET 2007 Chemistry - Class 12 AIPMT-2007-Ch-2287 Solution: The reaction of hydrogen and iodine monochloride is given as:…

The reaction of hydrogen and iodine monochloride is given as: H2(g)+2ICl(g)→2HCl(g)+I2(g)H_2(g)+2ICl(g)\rightarrow 2HCl(g)+I_2(g). This reaction is of first order with respect to H2(g)H_2(g) and ICl(g)ICl(g), following mechanisms were proposed. Mechanism A: H2(g)+2ICl(g)→2HCl(g)+I2(g)H_2(g)+2ICl(g)\rightarrow 2HCl(g)+I_2(g); Mechanism B: H2(g)+ICl(g)→HCl(g)+HI(g)H_2(g)+ICl(g)\rightarrow HCl(g)+HI(g) (slow); HI(g)+ICl(g)→HCl(g)+I2(g)HI(g)+ICl(g)\rightarrow HCl(g)+I_2(g) (fast). Which of the above mechanism(s) can be consistent with the given information about the reaction?

Multiple Choice Options

  • A A and B both
  • B Neither A nor B
  • C A only
  • D B only

Step-by-Step Verified Solution

The slow step is the rate determining step and it involves 1 molecule of H 2 (g) and 1 molecule of ICl(g) . Hence the rate will be, r = k[H 2 (g)] [ICl(g)] _ The reaction is 1 st order with respect to H 2 (g) and ICl(g).

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