AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The pH scale measures the concentration of hydrogen ions (H⁺) in a solution. A pH value of 7 represents a neutral solution.
Source: Chapter 2, Section 2.3
Examiners expect two things: (1) what pH measures — H⁺ ion concentration — and (2) the exact neutral pH value of 7. Both are needed for full credit even in a 1-mark question. Remember: pH < 7 = acidic, pH > 7 = basic, pH = 7 = neutral.