Nitrogen obtained from air is not absolutely pure because it contains the following except
oxygen
carbon (IV)oxide
inert gases
water vapour
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The correct answer is B. carbon (IV) oxide.
Nitrogen obtained from air is not absolutely pure because it typically contains traces of oxygen, inert gases (like argon), and water vapor. However, carbon (IV) oxide (CO₂) is usually removed during the purification process.
Nitrogen in the atmosphere naturally contains oxygen (21%), CO₂ (0.04%), inert gases, and water vapor.
Commercially obtained nitrogen gas is meant to be highly pure, so oxygen is usually removed completely.
If the question is asking about impurities in a purified nitrogen sample, then oxygen would indeed be the exception, because pure nitrogen should have no oxygen left.
if the context is about pure nitrogen gas, then the correct answer would be A. Oxygen because it is removed during purification.
But if the question is about nitrogen in the atmosphere, then the best answer should be B. Carbon dioxide
