Why Boiling point of water is increased on addition of Sodium Chloride into it ?

Answer

A,B

Explanation

`(X'_A)/(X'_B)=(P_A^@X_A)/(P_B^@X_B)`
`(X'_A)/(X'_B)gt X_A/X_B` (If `P_A^(@) gt P_B^(@)`)
(B)If `P_A^@` is more, more A will evaporate more and B will stay back in the solution.
(C )`P_T=P_A^(@)X_A+P_b^@ X_BneP_A^@+P_B^@`
(D)If `P_A^@gt P_B^@`.Then `P_A^@ gt P_T gt P_B^@`
`P_A^@ gt P_A^@X_A+P_B^@X_BgtP_B^@`.Hence boiling point of solution is more than A but less than B.