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Which statement about nitrogen is most accurate?

Answer and explanation

Correct answer: It is the major gas in air but is not the main gas used in respiration.

Correct answer: B. Nitrogen makes up about 78% of dry air, so it is the most abundant major gas in Earth’s atmosphere. However, humans and most animals use oxygen as the main gas for aerobic respiration, not nitrogen. Nitrogen is very important in nature, especially through the nitrogen cycle, but atmospheric nitrogen is not the gas that directly supports ordinary animal respiration. Option A is wrong because nitrogen is not the least abundant; it is the major component of dry air. Option C is wrong because nitrogen does not always change into water vapour; nitrogen and water vapour are different substances. Option D is wrong because ozone is the atmospheric substance chiefly associated with absorbing much harmful ultraviolet radiation. Nitrogen can be chemically transformed in particular biological or industrial processes, but that is not the same as always becoming water vapour. Memory cue: nitrogen is most abundant, oxygen is mainly used in respiration, and ozone helps absorb UV.

Related tags

NitrogenAtmospheric-CompositionRespirationOxygenUltraviolet-RadiationDistinctionFinancial Statements IAccountancy

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