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For an ideal solution formed by mixing liquids P and Q, $\Delta_{mix}H=0$ and $\Delta_{mix}V=0$
Reason: No interactions occur between P and Q
Detailed Solution
An ideal solution forms when the intermolecular attractive forces P-P and Q-Q are nearly equal to those between P-Q. Since the interactions remain nearly the same, $\Delta_{mix}H=0$ and $\Delta_{mix}V=0$. Interactions between P and Q do occur, so the Assertion is correct and the Reason is incorrect.