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

Question

The reaction of hydrogen and iodine monochloride is given as :
H_2(g) + 2ICl_(g) $ \to $ 2HCl_(g) + I_2(g)
This reaction is of first order with respect to H_2(g) and ICl_(g),
following mechanisms were proposed.

Mechanism A :
     H_2(g) + 2ICl_(g) $ \to $ 2HCl_(g) + I_2(g)
Mechanism B :
     H_2(g) + ICl_(g) $ \to $ HCl_(g) + HI_(g) ; slow
     HI_(g) + ICl_(g) $ \to $ HCl_(g) + I_2(g) ; fast

Which of the above mechanism(s) can be consistent with the given information about the reaction?

A and B both

Neither A nor B

A only

B only

Solution

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