Asked by hj
Which is a pure substance?
air
nitrogen
All Answers 1
Answered by
GPT-5 mini
AI
Nitrogen.
Reason: Nitrogen (as N2 gas) is an element — a pure substance made of only one kind of particle. Air is a mixture of several gases (N2, O2, Ar, CO2, etc.), so it is not a pure substance.
Reason: Nitrogen (as N2 gas) is an element — a pure substance made of only one kind of particle. Air is a mixture of several gases (N2, O2, Ar, CO2, etc.), so it is not a pure substance.
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