[Solved] To an evacuated vessel with movable piston under external pressure of 1 atm., 0.1 mol of He and 1.0 mol of an unknown compound (vapour pressure 0.68 atm, at 0^\\circ C) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0ºC is close to. - - JEE (Advanced) 2011 Paper-1