A container having 3 mole of gas occupies 60 litre at pressure P and temperature T . If 0.2 mole of gas are introduced at same P and T. Find the change in volume.

Question

$(a)\;10\;litre\qquad(b)\;4\;litre\qquad(c)\;5\;litre\qquad(d)\;6\;litre$