25. If

P^o and P are the vapour pressure of the pure solvent and solution and n₁  and n₂ are the moles of solute and solvent  respectively in the solution then the correct relation between P and P^o  is

a. P^o = P [n₁ / n₁ + n₂ ]

b. P^o = P  [ n₂ / n₁  +n₂ ]

[ n₂ / n₁  +n₂ ]

d. P = P^o [ n1 / n₁  +n₂ ]

Ans. c

(15)