A closed vessel with rigid walls contains 1.0 mol of component M (vapour pressure $$p_M^*$$) present as 0.9 mol liquid and 0.1 mol vapour. 0.1 mol of component N (vapour pressure $$p_N^*$$) is added slowly to maintain equilibrium conditions. Assume M and N form an ideal solution. The total pressure at the end of the addition will

A

decrease if $$p_{M}^* < p_{N}^*$$

B

decrease irrespective of relation between $$p_{M}^*$$ and $$p_{N}^*$$

C

increase if $$p_{M}^* < p_{N}^*$$

D

increase irrespective of relation between $$p_{M}^*$$ and $$p_{N}^*$$