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Railways PYQCBT 1 2016

RRB NTPC · Question 5

Which of the following gases is not colorless and odorless? A. Nitrogen B. Chlorine C. Hydrogen D. Oxygen

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Nitrogen, hydrogen and oxygen are all colourless and odourless gases. Chlorine is the exception: it is a greenish-yellow gas with a sharp, pungent, choking smell (the smell noticed near bleach or swimming pools). So chlorine is the gas that is not colourless and odourless.