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Question

A chemical reaction A+2BAB2 follows in two steps:


A+B AB (slow)
AB+B AB2 (fast)

Then the order of the reaction is:

A
3
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B
2
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C
1
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D
0
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Solution

The correct option is B 2
Slowest reaction will be rate-determining step:

A+B AB[slow]

Rate of reaction =k[A][B]

order=1+1=2

Order of the reaction can be known from the no. of reactants involved in rate-determining step (slow step).

Hence, option B is correct.

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