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NDA 2016 GAT · General Knowledge · Acids, Bases and Salts · easy

The pH of pure water at 25 °C is

Single correct option

The pH of pure water at 25 °C is
  1. A. 0
  2. B. 7
  3. C. 14
  4. D. 1
Show answer and solution

Answer: (B) 7

Pure water is neutral because [H⁺] = [OH⁻] = 10⁻⁷ mol/L at 25 °C, so pH = 7. Values below 7 are acidic and above 7 are basic. The pH 0 and pH 14 are extremes for strong acid and strong base solutions, and are not the pH of pure water.
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Original question written in the NDA 2016 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake