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A reaction is 50% completed in 2 hours and 75% completed in 4 hours. The order of reaction is

1. 0
2. 1
3. 2
4. 3

Correct answer: 1

Solution

The time taken for the reaction to go from 50% to 75% completion is the same as the time taken for the first 50% completion, indicating a constant half-life characteristic of a first-order reaction.

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