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A reaction is 50% complete in 2 hours an...

A reaction is `50%` complete in 2 hours and `75%` complete in 4 hours. What is the order of reaction?

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`t_(1//2)=2` hours. As `75%` completion takes two half lives, this shows that `t_(1//2)` is independent of initial concentration. Hence, it is a reaction of first order.
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