Which one of the following gas was used as a chemical weapon in the First World War?
- A. Carbon Monoxide
- B. Hydrogen Cyanide
- C. Mustard gas
- D. None of the above
Correct Answer: C. Mustard gas
Correct Answer: C. South Africa
Correct Answer: D. 1922
Correct Answer: D. 45
Correct Answer: B. Third
Correct Answer: B. Afghanistan
Correct Answer: D. Oder‐Neisse Line
The Germany–Poland border established after world war II is called Oder–Neisse line. It has a total length of 467 km (290 mi) and has been in place since 1945.