Decomposition of \( \mathrm{X} \) exhibits a rate constant for \( 0.05 \) \( \mu \mathrm{g} / \)...

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Decomposition of \( \mathrm{X} \) exhibits a rate constant for \( 0.05 \) \( \mu \mathrm{g} / \) year. How many years are required for the
\( \mathrm{P} \) decomposition of \( 5 \mu \mathrm{g} \) of \( \mathrm{X} \) into \( 2.5 \mu \mathrm{g} \) ?

W
[JEE Main-2019(January)]
(1) 50
(2) 25
(3) 20
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