Answer: B
Explanation:
At STP,
1 mole of gas has volume 22.4 L
then no of moles in 5.6 L gas will be
22.4
5.6
=0.25 moles
If 0.25 moles of gas weighs 60 g
then 1 mole of gas weighs=
60
------
0.25
=240g
Molar mass=240g
Molar mass=2×Vapourdensity
240=2×V.D
⇒V.D=120
Hence, the correct option is (B).
