{\H}_{2( {\g})}+2[ {\Cl}_{( {\g})} \to 2 {\HCl}_{( {\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(\beta)}+2 {\lCl}_{(\beta)} \to 2 {\HCl}_{(\beta)}+ {\I}_{2(\beta)} Mechanism B : {\H}_{2(g)}+ {\ICl}_{(g)} \to {\HCl}_{(g)}+ {\HI}_{(g)} ; Slow {\Hl}_{(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:

AIPMT 2007 Physics and Chemistry Paper

Question : 57 of 100

Marks: +1, -0

H2(g)+2[Cl(g)→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(β)+2lCl(β)→2HCl(β)+I2(β)
Mechanism B :
H2(g)+ICl(g)→HCl(g)+HI(g); Slow
Hl(g)+ICl(g)→HCl(g)+I2(g); Fast
Which of the above mechanism(s) can be consistent with the given information about the reaction:

A only
B only
A and B both
Neither A nor B

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