For an ideal solution, the correct option is :

(1) $\Delta$_{mix} S = 0 at constant T and P

(2) $\Delta$_{mix} V $\neq$ 0 at constant T and P

(3) $\Delta$_{mix} H = 0 at constant T and P

(4) $\Delta$_{mix} G = 0 at constant T and P

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Answer :

Δ_{mix} H = 0 at constant T and P

As, the solute and solvent interactions are equal for ideal solutions , the Δ_{mix} H = 0

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