Question:medium

The half-life of a zero order reaction A $\rightarrow$ products, is 0.5 hour. The initial concentration of A is 4 mol L$^{-1}$. How much time (in hr) does it take for its concentration to come from 2.0 mol L$^{-1}$ to 1.0 mol L$^{-1}$?

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Memorize the key equations for a zero-order reaction: Rate Law: Rate = k Integrated Rate Law: $[A]_t = [A]_0 - kt$ Half-life: $t_{1/2} = \frac{[A]_0}{2k}$ Unlike first-order reactions, the half-life of a zero-order reaction depends on the initial concentration.

Updated On: Mar 30, 2026

$1/4$
$1/8$
$1/2$
$1/6$

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The Correct Option is A

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