Assertion A : For an ideal solution formed by mixing liquids P and Q , _ mix H=0 and _ mix V=0 Reason R : No interactions occur between P and Q . In the light of the above statements, choose the most appropriate answer from the options given below.

Step-by-step solution

For an ideal solution formed by mixing two liquids P and Q , the enthalpy of mixing ( _ mix H ) and the volume of mixing ( _ mix V ) are both zero. Thus, Assertion A is correct. In an ideal solution, the intermolecular attractive forces between the solute and solvent molecules ( P-Q interactions) are of the same magnitude as those between the pure components ( P-P and Q-Q interactions). It is incorrect to state that no interactions occur between P and Q . Thus, Reason R is not correct. Therefore, A is correct but R