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. Water Gas

  4. Mustard Gas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mustard gas (sulfur mustard) was extensively used as a chemical weapon in World War I, causing severe blistering and respiratory damage. It was first used by Germany in 1917. Carbon monoxide is a toxic gas but not used as a weapon in WWI. Hydrogen cyanide (Zyklon B) was used later in WWII. Water gas is a fuel mixture, not a weapon.

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