Which one of the following gases is placed second in respect of abundance in the Earths atmosphere ?

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Q: 67 (NDA-II/2017)

Which one of the following gases is placed second in respect of abundance in the Earth’s atmosphere ?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,53,18,53,6,9,3

keywords: 

{'gases': [0, 0, 5, 12], 'atmosphere': [1, 1, 4, 7], 'carbon dioxide': [2, 0, 5, 6], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'hydrogen': [0, 0, 1, 3], 'abundance': [2, 0, 2, 4], 'earth': [0, 1, 1, 1]}

The correct answer is option 1: Oxygen.

Oxygen is the second most abundant gas in the Earth`s atmosphere, after nitrogen. Nitrogen is the most abundant gas, making up about 78% of the atmosphere, while oxygen accounts for roughly 21%. The remaining 1% consists of trace gases including carbon dioxide, helium, methane, and others.

Oxygen is essential for the survival of most living organisms on Earth. It is used in various biological processes, including respiration, where it is taken in by organisms and converted into energy. Additionally, oxygen is involved in the process of photosynthesis, where it is produced by plants and algae, converting sunlight into energy and releasing oxygen as a byproduct.

While hydrogen is a common element in the universe, it is not as abundant in the Earth`s atmosphere. Hydrogen is a light gas that tends to escape into space due to its low molecular weight. Carbon dioxide, on the other hand, is a trace gas in the atmosphere, making up only about 0.04% of the total composition.

In conclusion, the second most abundant gas in the Earth`s atmosphere is oxygen.