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  4. If initial concentration is reduced to 1 / 4 text th in a zero order reaction, the time taken for half the reaction to complete

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Q. If initial concentration is reduced to $1 / 4^{\text {th }}$ in a zero order reaction, the time taken for half the reaction to complete

Chemical Kinetics

Solution:

$r = K [ A ]^{0}$
$t _{1 / 2}=\frac{ a }{2 K } \Rightarrow \frac{1}{4}\frac{ a }{2 K } $
$\Rightarrow $ becomes one fou th of initial half life.
$\therefore a' \Rightarrow \frac{1}{4} a$