1.

Mechanism of hypothetical reaction X_(2) + Y_(2) to 2 XY is given below (i) X_(2) to X + X(fast ) (ii) X + Y_(2) hArr XY + Y (slow) (iii)X + Y to XY (fast) The overall order of the reaction will be

Answer»

2
0
1.5
1

Solution :According to law of mass action
R = `K [X] [Y_(2)] "" … (i)`
From fast step
`K_(eq) = ([X]^(2))/([X_(2)])`
`[X]^(2) = K_(eq) [X_(2)]`
[X] = `sqrt(K_(eq))[X_(2)]^(1//2) …. (ii)`
From equation (i) & (ii)
`r = K [X_(2)]^(1//2) [Y_(2)]`
`r = K[X_(2)]^(1//2) [Y_(2)]` .
OVERALL order of reaction = 1 + 0.5 = 1.5


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