A 10 litre container at 400K  contains CO2g at 0.1 atm and an excess solid metal oxide, MO. The volume of the container is now decreased by moving the movable piston fitted to the container. Maximum volume of the container when the pressure of  CO2   attains its maximum value will beMCO3(s)⇌MO(s)+CO2(g) ;  ( Kp = 0.8 atm)