Excess phosphorus was burnt in a gas jar and the residual gas passed successively over...

JAMB 1998

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

WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Correct Answer: Option B

Explanation

So phosphorus will remove oxygen by forming P205, KOH will absorb water vapors, and sulfuric acid will react with carbon dioxide thus removing it from the mixture. So nitrogen and rare gases will be left

Previous Next

Go back to Chem classroom

Report an Error Ask A Question Download App