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In the reaction aA+bB to products, if co...

In the reaction `aA+bB to` products, if concentration of A is doubled (keeping B constant) the initial rate becomes four times and if B is doubled (keeping A constant), the rate becomes double. What is the rate law equation and order of reaction ?

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Rate `=k[A]^(2)[B]," order "=2+1=3`
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