Question

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

Answer 1

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