For the first order reaction $A \to B$ Br the half life is $30 mm$. The time taken for $75 \%$ completion of the reaction is mm. (Nearest mteger)
Given : $\log 2=0.3010$
$\log 3=0.4771$
$\log 5=0.6989$
$t _{1 / 2}=T _{50}=30 min$
$T _{75}=2 t _{1 / 2}=30 \times 2=60 min$
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