The reaction \( 2 \mathrm{x} \rightarrow \mathrm{B} \) is a zeroth roder reaction. If the intial...

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The reaction \( 2 \mathrm{x} \rightarrow \mathrm{B} \) is a zeroth roder reaction. If the intial concentration of \( \mathrm{X} \) is \( 0.2 \mathrm{M} \), the half life is \( 6 \mathrm{~h} \).
\( \mathrm{P} \) When the initial concentration of \( \mathrm{X} \) is \( 0.5 \mathrm{M} \), the time

W require to reach its final concentration of \( 0.2 \mathrm{M} \) will be:
[JEE Main-2019 (January)]
(1) \( 9.0 \mathrm{~h} \)
(2) \( 12.0 \mathrm{~h} \)
(3) \( 18.0 \mathrm{~h} \)
(4) \( 7.2 \mathrm{~h} \)
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