Can anyone help me??this question from chemistry 9th class Sri Chaitan – InterviewSolution

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Can anyone help me??this question from chemistry 9th class Sri Chaitanya CBSE board

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EXPLANATION:

let INITIAL concentration be a∅

after concentration decreases by

1/4=a∅(1-1/4)=3a∅/4

using first order KINETIC equation,

t1/4*k=In(a∅/3a∅/4)

=In(4/3)

t 1/4=0.29/k

is the ANSWER

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