One litre of an unknown gas weighs $1.25 g$ at $S T P$ . Which of the following gas pertains to the above 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 $N_{2}$
1 L of gas at NTP weighs $1.25 g .$
Then, 22.4 L will weigh $22.4 \times 1.25 = 28$ g.
This is the molar mass of gas.
Hence, the gas is $N_{2}$

So, the correct option is $C$

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