Chemistry - Study Mode
[#791] Which one of the following was used as a chemical weapon in the first world war ?
Correct Answer
(C) Mustard gas
Explanation
Solution: Although the Germans were the first to use phosgene on the battlefield, it became the primary chemical weapon of the Allies. Phosgene was responsible for 85% of chemical-weapons fatalities during World War I. Mustard gas, a potent blistering agent, was dubbed King of the Battle Gases.
[#792] The depletion of ozone layer is due to
Correct Answer
(A) Chlorofluorocarbons
Explanation
Solution: Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
[#793] Ozone depletion in the atmosphere is mainly caused by
Correct Answer
(D) Chlorofluorocarbon
Explanation
Solution: Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
[#794] Ozone depletion in the stratosphere is mainly caused by
Correct Answer
(D) Chlorofluorocarbons
Explanation
Solution: Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
[#795] Which of the following is ozone depleting pesticide ?
Correct Answer
(C) Methyl bromide
Explanation
Solution: Methyl bromide- is considered to be a significant ozone depleting substance (ODS) by atmospheric scientists. While methyl bromide is a natural substance, the additional methyl bromide added to the atmosphere by humans contributes to the thinning of the ozone layer, allowing increased UV radiation to reach the earth’s surface, with potential impact not only to human health and the environment, but to agricultural crops as well.