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Railways PYQCBT 1 2016

RRB NTPC · Question 23

Four pairs of words are given, three of which are similar in some way and one is odd. Choose the odd one. A. Hydrogen : Sulphuric acid B. Chlorine : Salt C. Oxygen : Water D. Nitrogen : Hydrochloric Acid

  1. C

  2. B

  3. D

  4. A

Show answer & explanation

Answer: (C) D

Explanation

In each pair the first element is a constituent of the compound: hydrogen is in sulphuric acid (H₂SO₄), chlorine in salt (NaCl) and oxygen in water (H₂O). Hydrochloric acid (HCl) contains hydrogen and chlorine but no nitrogen, so Nitrogen : Hydrochloric acid is the odd pair.