One litre of an unknown gas weighs $1.25$ g at N.T.P. Which of the following gas pertains to the given data.

C O_{2}

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N O_{2}

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N_{2}

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O_{2}

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Solution

The correct option is B $N_{2}$
Weight of gas= $1.25 g$ , V= $1 L$
N.T.P
Volume of gas= $22.4 L$ for $1$ mole
$24 L o f g a s ⟶ 1 m o l e o f G a s 1 L o f g a s ⟶ \frac{1}{22.4} m o l e o f G a s ⟶ 0.0446 m o l e 0.0446 m o l e n = \frac{x}{M} m o l e = \frac{m a s s}{m o l a r m a s s} M = \frac{x}{n} = \frac{1.25}{0.0446} = 28.02 28.02 ≃ 28. g$
Thus the gas is $N_{2}$

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1.25 g

S T P

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