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The per cent of `N "in" 66%` pure `(NH_(4))_(2)SO_(4)` sample is:

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The per cent of `N "in" 66%` pure `(NH_(4))_(2)SO_(4)` sample is:
A. `32`
B. `28`
C. `14`
D. none of these
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Correct Answer - C
`:. 132 g (NH_(4))_(2)SO_(4)` has `N=28 g`
`:. 66 g(NH_(4))_(2)SO_(4)` has `N=(28xx66)/(132)=14 g`
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