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Railways PYQCBT 1 2016

RRB NTPC · Question 26

Which one of the following is not alkaline? A. Sodium B. Potassium C. Lithium D. Sulphur

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (B) D

Explanation

Sodium, potassium and lithium are alkali metals (Group 1); they form strongly alkaline hydroxides such as NaOH and KOH. Sulphur is a non-metal whose oxides form acids (such as H₂SO₄), so it is not alkaline.