Question
Which one of the following statements is NOT correct?
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- 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
- 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
Answer
B. The higher the hydrogen ion concentration in a solution, higher is its pH
Step-by-step solution
The pH of a solution is defined as the negative logarithm to the base 10 of the hydrogen ion concentration, expressed as pH = - _ 10 [H^+]. Because of the negative sign in the formula, an increase in the hydrogen ion concentration [H^+] results in a decrease in the pH value. Therefore, the higher the hydrogen ion concentration in a solution, the lower is its pH. The other statements are correct: the pH scale measures hydrogen ion concentration, it generally ranges from 0 to 14, and the 'p' stands for 'potenz' (meaning power) in German. Answer: The higher the hydrogen ion concentration in a solution, higher is its pH
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