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A reaction is 50% completed in 2 hours a...

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

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`t_(1//2) =2H rs`
After 75% completion, 2half lives, `t_(1//2)` is independent of initial concentration of reactant, reaction of `1^(st)` order.
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