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First Order Reaction

The catalytic...

Question

The catalytic decomposition of $N_{2} O$ by gold at $900^{\circ}$ C and at an initial pressure of 200mm is 50% complete in 53 minutes and 73% complete in 100 minutes.
The order of the reaction is:

A

1

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B

2

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C

3

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D

0

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Solution

The correct option is D 1
The reaction is 50% complete in 53 minutes. Thus half life period is 53 minutes.
The reaction is 73% complete in 100 minutes.
The reaction will b 73% complete in approximately 106 minutes.
The half life period is independent of the concentration.
Hence, the reaction is of first order.

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