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The following mechanism has been propose...

The following mechanism has been proposed for the reaction of `(NO)` with `(Br)_(2)` to form `NOBr`. `(NO)(g)+(Br)_(2)(g) harr (NOBr)_(2)(g). NOBr2 (g) + NO (g) = 2NOBr (g) `. ` If the 2nd step is the rate determining step , the order of the reaction with respect to `(NO)(g)` is

A

1

B

0

C

3

D

2

Text Solution

Verified by Experts

The correct Answer is:
D
From the given reactions, the rate expression for the second reaction is
Rate `= k[NOBr_(2)][NO]`. However, `[NOBr_(2)] = K_( c) [NO][Br_(2)]`.
Rate `= k. K_(c )[NO][Br_(2)][NO]` where `K_(c) = ([NOBr_(2)])/([NO][Br_(2)])` or Rate `= k.[NO]^(2)[Br_(2)]`
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