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NDA 2018 GAT · General Knowledge · Acids, Bases and Salts · easy

Which of the following has the highest pH?

Single correct option

Which of the following has the highest pH?
  1. A. Lemon juice
  2. B. Vinegar
  3. C. Pure water
  4. D. Milk of magnesia
Show answer and solution

Answer: (D) Milk of magnesia

Milk of magnesia is a suspension of magnesium hydroxide, a weak base, with pH around 10. Pure water is neutral at pH 7, while vinegar and lemon juice are acidic with pH below 7. A higher pH means a more basic solution, so the base has the highest value.
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Original question written in the NDA 2018 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