Correct option is A
For an Ideal gas
Density = mass /volume
Now from ideal gas equation, PV = nRT eqn. (i)
given that n = m/M
where m = mass of gas, M = Molar mass of gas putting value in eqn. (i)
PV = (m/M) RT
Now substitute the value of V in the density expression to get
d = PM/RT
Density of ideal gas is inversely proportional to absolute temperature.
Hence, The density of an ideal gas can be doubled by halving the absolute temperature.
