Identify the wrong relation for real gases :

Which property of $$\mathrm{CO}_2$$ makes it biologically and geo-chemically important?

The volume of $$2.8 \mathrm{~g}$$ of $$\mathrm{CO}$$ at $$27^{\circ} \mathrm{C}$$ and 0.821 atm pressure is ($$R=0.08210 \text { L. atm K} \mathrm{~mol}^{-1}$$)

When the absolute temperature of ideal gas is doubled and pressure is halved, the volume of gas