Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H₂SO₄ before being collected in a flask. The gases collected are?

A. carbon (IV) oxide, nitrogen and the rare gases
B. nitrogen and the rare gases
C. carbon (IV) oxide, nitrogen (IV) oxide and the rare gases  
D. carbon (IV) oxide

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Correct Answer: C