QJEEM21Chda3e: JEE Main 2021 Chemistry - Class 12 JEEM21Chda3e Solution: For a first order reaction, the ratio of the time for 75%…

Question

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For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is ____________. (Integer answer)

Accepted Answer

k = {{2.303} \over t}\log {a \over {a - x}}

{{2.303} \over {{t_{50\% }}}}\log {{100} \over {100 - 50}} = {{2.303} \over {{t_{75\% }}}}\log {{100} \over {100 - 75}}

\Rightarrow

{t_{75\% }} = 2{t_{50\% }}

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