Which one of the following statements is NOT correct?
A.A scale measuring hydrogen ion concentration in a solution is called pH scale
B.The higher the hydrogen ion concentration in a solution, higher is its pH✓ Correct
C.We can measure pH generally from 0 to 14 on a pH scale
D.The 'p' in pH stands for 'potenz' in German meaning power
Explanation
Statement (b) is incorrect because pH and hydrogen ion concentration have an inverse relationship: pH = −log[H⁺]. Therefore, the higher the hydrogen ion concentration, the LOWER (not higher) the pH. A solution with high [H⁺] is more acidic, having a low pH (closer to 0). Statement (a) is correct as pH does measure H⁺ ion concentration. Statement (c) is correct: the pH scale typically ranges from 0 to 14. Statement (d) is correct: 'p' in pH stands for 'potenz' (German for power/potential).
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