A → B The above reaction is of zero order. Half life of this reaction is 50 min . The time taken for the concentration of A to reduce to one-fourth of its initial value is min . (Nearest integer)

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The integrated rate equation of zero order reaction is

$kt = A_{0} - A_{t}$

Assume reaction starts with $1$ mole A

$t_{1 / 2} = \frac{a}{2 k}, K = \frac{1}{2 \times 50}$

For $75 %$ completion

$A_{0} = a, A_{t} = \frac{a}{4}$

$a - \frac{a}{4} = kt$

$t = \frac{3}{4} \frac{a}{k} = \frac{3}{4} \times \frac{100}{a} = 75 \min$

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