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For a reaction : aA rarr bB, the rate of...

For a reaction : `aA rarr bB`, the rate of reaction is doubled when the concentration of A is increased by four times. The rate of reaction is equal to

A

`k[A]^(2)`

B

`k[A]^((1)/(2))`

C

`k[A]^((1)/(a))`

D

`k[A]`

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