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Question

At 273 K temperature and 76 cm Hg pressure, the density of a gas is 1.964 gL1. The gas is :

A
CH4
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B
CO
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C
He
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D
CO2
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Solution

The correct option is D CO2
We know,
PV=nRT
PV=WMRT
Or, M=dRTP
Given,d=1.964 g/l
P=76 cm=760 mmHg=1 atm
R=0.0821 l atm K1mol1
T=273 K
M=1.964×0.0821×273144
So, gas is CO2

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