1.

The order of the reaction occuring by following mechanism should be (i) A_(2) to A + A (fast ) "" (ii) A+ B_(2) to AB + B (Slow ) (iii) A + B to (Fast)

Answer»

`1 (1)/(2)`
`3(1)/(2)`
2
None of these

Solution :The rate will be given by slowest step . THUS r = k`[A][B_(2)] , K_(C) = ([A][A])/([A_(2)]) ` or [A] = `[K_(c)]^(1//2) [A_(2)]^(1//2)`
`r = K xx [K_(c)]^(1//2) [A_(2)]^(1//2) [B_(2)] = k[A_(2)]^(1//2) [B]`. Thus order is
0.5 + 1 = 1.5.


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