Two liquids A and B form an ideal solution at 300 K, the vapour pressure of a solution containing 1 mol of A and 3 mol of B is 550 mm Hg. At the same temperature if one mol B is added to this solution, the vapour pressure of the solution increases by 10 mm Hg. The vapour pressure of pure A is

Options

A. 600 mm Hg
B. 100 mm Hg
C. 400 mm Hg
D. 500 mm Hg

Answer

C

Explanation

400 mm Hg