What is the pH value of pure water at 25°C?
Difficulty: Medium
About this MCQ
This Medium Everyday Science MCQ checks one syllabus fact. Candidates use it for NTS GAT General, PPSC Lecturer practice.
The question is: “What is the pH value of pure water at 25°C?”
The accepted answer is B. 7. Pure water at 25°C has a neutral pH of 7, meaning equal concentrations of H+ and OH− ions. Values below 7 are acidic; above 7 are basic.
- A. 5
Why not A: pH 5 is acidic.
- B. 7 ✓
- C. 9
Why not C: pH 9 is alkaline.
- D. 14
Why not D: pH 14 is strongly alkaline.
Correct answer
B. 7
Explanation
Pure water at 25°C has a neutral pH of 7, meaning equal concentrations of H+ and OH− ions. Values below 7 are acidic; above 7 are basic.
Source: General chemistry — pH scale
Tags: Chemistry
Relevant exams: NTS GAT General, PPSC Lecturer
Submitted by: MCQsHub Editorial
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