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Question

The rate of gaseous reaction is given by K[A][B]. If the volume of reaction vessel is reduced to 1/4 of initial volume the reaction rate relative to the original rate is?

A
116
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B
18
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C
8
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D
16
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Solution

The correct option is D 16

As the rate=K[A][B] where [A]=conc of A
[B]=conc. of B

We know that Concentration=number of molesVolume

therefore we decrease the volume of vessel to 1/4th intial volume the conc of A and B both will increase by 4 times { conc is inversely proportional to volume } .
so final conc of A will become =4[A]
final conc of B will become =4[B]

Final rate of reaction=k.4[A]×4[B]
=16k[A][B]

Option D is correct.


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