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A hypothetical reaction A2 + B2 rarr 2AB...

A hypothetical reaction `A_2 + B_2 rarr 2AB` follows the following given mechanism :
`A_2 iff A+A`(fast)
`A+B_2 rarr AB +B`(slow)
`A+B rarr AB`(fast)
The order of the overall reaction will be :

A

2

B

1

C

`1 1/2`

D

zero

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The correct Answer is:
C
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