1
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Question

# For a reaction, A+B→C+D, if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of reaction is:

A
2
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B
1
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C
32
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D
43
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Solution

## The correct option is C 32For the reaction, A+B→C+D Rate=k[A]α[B]β...(i) 2×rate=k[2A]α[B]β...(ii) 3×rate=k[2A]α[9B]β...(iii) From equations, (i) and (ii), α=1 From equations, (i) and (iii), β=12 Order=α+β=1+12=32

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