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Question

For the reaction 2NO+Br22NOBrthe following mechanism has been given:
NO+Br2NOBr2
NOBr2+NO2NOBr (slow)
Hence, the rate law is :

A
k[NO]2[Br2]
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B
k[NO][Br2]
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C
k[NOBr2][NO]
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D
k[NO][Br2]2
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Solution

The correct option is A k[NO]2[Br2]
The mechanism is given asNO+Br2KCNOBr2NOBr2+NOslow2NOBrSo, the rate of the reaction is, dxdt=k[NOBr2][NO] .......(1)Kc=[NOBr2][NO][Br2] ......(2)[NOBr2] =Kc[NO][Br2]putting this value of [NOBr2] in equation (1),we get dxdt=kKc[NO]2[Br2]=k[NO]2[Br2]

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