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Question

For the reaction a AxP when [A]=2.2mM the rate was found to be 2.4mMs1 . On reducing concentration of A to half, the rate changes to 0.6mMs1 . The order of reaction with respect to A is:

A
1.5
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B
2
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C
2.5
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D
3
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Solution

The correct option is B 2
rate=k[A]n
2.4=k(2.2)n (1)
Now
0.6=k(1.1)n (2)
(1)÷(2)
4=2n
only possible when
n = 2

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