Question

57. A hypothetical reaction, A2 + B2 - →2 AB follows the
mechanism as given below,
A2 = A + A (fast)
A + B2 → AB + B (slow)
A + B -→ AB (fast)
The order of the overall reaction is
(a) (b) 1 (c) 1 / (d) 0
2​

Answer 1

Answer:

this is 2nd order reaction

Answer 2

Answer:1.5

Explanation: A + B2 -> AB + B .....Slow

r= k[A][B2]

Equilibrium

A2 -> A+A .......fast

Keq = [A]2/[A2]

[A] = (Keq[A2])1/2

r=K.Keq [A2]1/2 [B2]

Order = 1/2+1= 1.5