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Decomposition of X exhibits a rate const...

Decomposition of X exhibits a rate constant of `0.5 mu g //` year. How many years are required for the decomposition of `5mu g` of X into `2.5 mu g` ?

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The correct Answer is:
5
According to the unit of rate constant `(0.05 mu g//` year), it is a zero order reaction .
`rArr t_(1//2)=(a_o)/(2k_o)=(5)/(2xx0.5)=5` years.
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