Question

Molar volume of $C{O}_2$ is maximum at:

• A. $0^{\circ }\text{C}$ and $2.0\text{atm}$
• B. S.T.P
• C. ${273}^{\circ }\text{C}$ and $2\text{atm}$
• D. ${127}^{\circ }\text{C}$ and $1\text{atm}$

Answer 1

The correct option is D ${127}^{\circ }\text{C}$ and $1\text{atm}$

From the ideal gas equation,
$PV=RT$ or $V=RT/P$ or $V\propto \frac{T}{P}$

Volume of the gas increases with increase in temperature and decreases with increase in pressure.

Greater the value of $T/P$, greater is the volume.
$\frac{T}{P}$ values of the given options are :
(T is in K and P is in atm)
a) 136.5
b) 273
c) 273
d) 400
Hence D is the right answer.