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If doubling the concentration of a react...

If doubling the concentration of a reactant `'A'` increases the rate `4` times and tripling the concentration of `'A'` increases the rate `9` times, the rate is proportional to

A

Concentration of 'A'

B

Square of concentration of 'A'

C

Under root of the concentration of 'A'

D

Cube of concentration of 'A'

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The correct Answer is:
B
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