JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
Two liquids A and B form an ideal solution. At 320 K, the vapour pressure of the solution, containing 3 mol of A and 1 mol of B is 500 mm Hg. At the same temperature, if 1 mol of A is further added to this solution, vapour pressure of the solution increases by 20 mm Hg. Vapour pressure (in mm Hg) of B in the pure state is _________ .(Nearest integer)
- A 100
- B 200
- C 300
- D 400
Answer & Solution
Correct Answer
(B) 200
Step-by-step Solution
Detailed explanation
\(X _{ A }=\frac{3}{4}, X _{ B }=\frac{1}{4}\) \(P_S=P_A^o X_A+P_B^o X_B\) \(500= P _{ A }^{ o } \times \frac{3}{4}+ P _{ B }^{ o } \times \frac{1}{4}\) \(3 P _{ A }^{ o }+ P _{ B }^{ o }=2000\)\(\quad\)....(1) Now 1 moles of A is further added so \(n _{ A }=4\) mole,…
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