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The half-life of first order decompositi...

The half-life of first order decomposition of `NH_(4)NO_(3)` is 2.10 hr at 288 K temperature
`NH_(4)NO_(3)(aq)toN_(2)O(g)+2H_(2)O(l)`. If 6.2 of `NH_(4)NO_(3)` is allowed to decompose, the required for `NH_(4)NO_(3)` to decompose 90 % is :

A

6.978 hr

B

0.319

C

0.319 hr

D

None of these

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The correct Answer is:
A
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