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The rate of reaction, 2A+B(2) to 2 AB, ...

The rate of reaction, `2A+B_(2) to 2 AB`, becomes double when the conc. Of `B_(2)` is doubled. However, when the conc. Of both the reactants are tripled simultaneously, the rate becomes nine times. What is order of reaction

A

First

B

Second

C

Third

D

Zero

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