Question 27
Nitrogen and its CompoundsThe nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with
- A.some unburnt phosphorus
- B.P2O5 vapour
- C.some oxygen
- D.rare gases
- E.carbondioxide.
Show the answer and explanation
Answer: D (rare gases)
Explanation
Removing oxygen from air leaves nitrogen mixed with about 1% of rare gases, mainly argon, which is denser than nitrogen.