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If doubling the concentration of a react...

If doubling the concentration of a reactant `X` in a reaction `X+Y rarr` Products, increases the rate times and tripling its concentration increases the rate nine times, this indicates that the rate of reaction is proportional to the ………….of the concentration of.............and thus rate is given by........... .

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The correct Answer is:
square, `X, k[X]^(2)`
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