Match the following equilibria with the corresponding condition.

A. LiquidVapour 1. Saturated solution
B. SolidLiquid 2. Boiling point
C. SolidVapour 3. Sublimation point
D. Solute (s)Solute (solution) 4. Melting point
5. Unsaturated solution

Codes:

A B C D
1. 2 4 3 1
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 3 2
Hint: At the boiling point, the liquid phase is converted into the vapour phase.

Explanation: 
A. LiquidVapour equilibrium exists at the boiling point.
B. SolidLiquid equilibrium exists at the melting point.
C. SolidVapour equilibrium exists at the sublimation point.
D. Solute (s)Solute (solution) equilibrium exists at a saturated solution.