The pH of a solution indicates its acidity or alkalinity on a scale from 0 to 14. A pH of 7 is considered neutral, indicating that the solution is neither acidic nor alkaline.
When two solutions, P and Q, are mixed, resulting in a solution with a pH of 7, it implies that the individual pH values of solutions P and Q must also be 7.
Therefore, the pH value of both solution P and solution Q is 7.