The half life of a first order reaction is 10 minutes. If \( \mathr...

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The half life of a first order reaction is 10 minutes. If
\( \mathrm{P} \) initial amount is \( 0.08 \mathrm{~mol} / \) litre and concentration at

W. some instant is \( 0.01 \mathrm{~mol} / \) litre, then \( t= \)
(1) 10 minutes
(2) 30 minutes
(3) 20 minutes
(4) 40 minutes
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