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For the reaction, 2A + B → products, when the concentrations of A and B both were doubled, the rate of the reaction increased from 0.3 mol L –1 s –1 to 2.4 mol L –1 s –1 . When the concentration of A alone is doubled, the rate increased from 0.3 mol L –1 s –1 to 0.6 mol L –1 s –1 . Which one of the following statements is correct?

1. Order of the reaction with respect to A is 2.
2. Total order of the reaction is 4.
3. Order of the reaction with respect to B is 1.
4. Order of the reaction with respect to B is 2.

Correct answer: Order of the reaction with respect to B is 2.

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