Post-UTME Chemistry 2014 Objective — Question 4
Question 4 of 10 from the Post-UTME Screening (Post-UTME) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen-containing compounds because of
- A. water vapour
- B. oxygen
- C. carbon (IV) oxide
- D. rare gasesCorrect
Explanation
Nitrogen extracted from air is contaminated with small amounts of denser rare (noble) gases like argon, making it slightly denser than chemically-prepared pure nitrogen - this discrepancy led to the discovery of argon. (No printed answer key for this session; answer worked out independently.)
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