Question : For an ideal solution, the **correct** option is :

(1) Δ_{mix} S = 0 at constant T and P

(2) Δ_{mix} V ≠ 0 at constant T and P

**(3) Δ _{mix} H = 0 at constant T and P **

(4) Δ_{mix} G = 0 at constant T and P

Answer : from all above options the correct answer is “**(3) Δ _{mix} H = 0 at constant T and P **” first of all you must know that ideal solution must obey the rule of Raoult on all concentration and temperature conditions. for a ideal solution the

**Δ**must be

_{mix}H**zero**at a constant temperature and pressure . that is why we have marked option (3) for correct answer.

Answer explanation : The conditions of ideal solution are as follows :

if we talk about the definition of ideal solution then you must write that the solution which contains similar interactions between solute-solvent (A-B) , if the solvent consists (A-A) interactions and solute particles consists (B-B) interactions then between solute-solvent interactions will be found (A-B), these types of solution is called ideal solution , and ideal solution fulfill the condition of it’s equation which is given above.