Which of the following components of air is present in the largest amount in the atmosphere?
A. Nitrogen
B. Oxygen
C. Water vapour
D. Carbon-dioxide

Hint: The atmosphere of the Earth contains around $ 78\% $ Nitrogen and $ 21\% $ Oxygen. There are also trace amounts of several other gases in the air, including Carbon dioxide, Neon, and Hydrogen.

Complete answer:
Nitrogen, oxygen, water vapour, and carbon dioxide are all components of atmospheric air. The most abundant gas in the atmosphere is nitrogen. It takes up $ 78.9\% $ of the available space in the universe.
Hence, the correct option is: A. Nitrogen

Additional Information:
The process of nitrogen fixation, which is a continual cycle between living organisms and the atmosphere, produces nitrogen. In addition, fractional distillation of air in its liquid form is used in industry. Dinitrogen $ \left( {{N_2}} \right) $ is a molecule made up of two nitrogen atoms that are joined together by a strong triple bond. $ {N_2} $ is difficult to decompose due to its triple bond, therefore the process of decomposition, which includes actions such as exploding, produces a large quantity of useful energy.

Note:
It should be noted that, Nitrogen can be found in living organisms in the form of nucleic acids and amino acids. Fertilizers contain a significant amount of nitrogen created artificially. Nitrogen is also used in medicine, with the most common applications being in numerous medications and even antibiotics. Nitrogen is a non-toxic gas, but when it is released in a closed environment, it can displace oxygen, resulting in hypoxia.