Multiple choice

Which one of the following was used as a chemical weapon in the First World War?

  1. Carbon monoxide

  2. Hydrogen cyanide

  3. Mustard gas

  4. Water gas

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mustard gas (sulfur mustard) was extensively used as a chemical weapon during World War I, causing severe blistering of the skin, eyes, and respiratory tract. It was called mustard gas due to its mustard-like odor and yellow-brown color. While hydrogen cyanide was also used, mustard gas was one of the most widely deployed chemical agents. Carbon monoxide and water gas were not used as chemical weapons.