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Which of the following is the most abundant gas in the Earth's atmosphere?
Oxygen (~20.95%)
Carbon Dioxide (~0.04%)
Nitrogen (~78.08%)
Argon (~0.93%)
Nitrogen (~78.08%)
Nitrogen is the most abundant gas in the Earth's atmosphere, constituting approximately 78.08% of the air by volume. It acts as a stable, inert diluent for oxygen, preventing rapid combustion and oxidation processes on the Earth's surface.
Nitrogen is the most abundant gas in the Earth's atmosphere, constituting approximately 78.08% of the air by volume. It acts as a stable, inert diluent for oxygen, preventing rapid combustion and oxidation processes on the Earth's surface.
Think of nitrogen as the 'filler' material in a package of chips; just as nitrogen prevents the chips from being crushed by providing bulk, it fills our atmosphere to dilute oxygen and prevent runaway fires.
N-O-A-C: Nitrogen (78%), Oxygen (21%), Argon (0.9%), Carbon Dioxide (0.04%).
N2тАЛтЙбN тАФ Represents the triple bond in the nitrogen molecule
78.08%тЙИ54тАЛ тАФ Approximate fractional composition by volume
The stability of atmospheric nitrogen (N2тАЛ) is due to the extremely strong triple covalent bond between the two nitrogen atoms. This bond energy is roughly 945┬аkJ/mol, making N2тАЛ chemically inert under standard temperature and pressure. It does not react readily with other atmospheric components, which allows it to remain at high concentrations.
Nitrogen is a diatomic molecule (N2тАЛ)
It is non-reactive and colorless, odorless, and tasteless
It is a key component of amino acids and nucleic acids in living organisms
Atmospheric pressure at sea level is largely maintained by the mass of nitrogen gas
Dilutes oxygen to prevent spontaneous combustion
Essential for protein synthesis in biological life cycles via nitrogen fixation
High concentrations can cause nitrogen narcosis under high-pressure environments (e.g., deep-sea diving)
Used in food packaging to prevent oxidation and spoilage
Liquid nitrogen is used as a refrigerant for cryogenic storage
Oxygen (O2тАЛ) accounts for approximately 20.95% of the atmosphere.
Argon (Ar) is the third most abundant gas at 0.93%.
Carbon Dioxide (CO2тАЛ) is a trace gas at approximately 0.04%.
Nitrogen is biologically fixed into soil by bacteria like Rhizobium.
C is correct тАФ Nitrogen gas (N2тАЛ) accounts for about 78% of the Earth's atmosphere by volume.
Always remember the order of abundance: N > O > Ar > COтВВ. This is a favorite factual question in competitive exams like UPSC and SSC.
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