Single correct option
An aqueous solution of which of the following salts has a pH greater than 7?
- A. Sodium chloride
- B. Ammonium chloride
- C. Sodium carbonate
- D. Potassium nitrate
Show answer and solution
Answer: (C) Sodium carbonate
Sodium carbonate is the salt of a strong base (NaOH) and a weak acid (carbonic acid), so its carbonate ion hydrolyses and gives a basic solution. Sodium chloride and potassium nitrate come from strong acids and bases and are neutral, while ammonium chloride is acidic.
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