O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2019 · Q51 Mark
Sulfur dioxide is a gas that is prepared by heating sodium sulfite with hydrochloric acid. It is an acidic gas. Sulfur dioxide is more dense than air. Which set of apparatus is suitable for preparing and collecting a dry sample of sulfur dioxide?
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AApparatus showing gas generation, drying with calcium oxide in a U-tube, and collection by displacement of water.
BApparatus showing gas generation, drying with concentrated sulfuric acid in a U-tube, and collection by upward displacement of air (delivery tube to bottom of flask).
CApparatus showing gas generation, drying with concentrated sulfuric acid in a U-tube, and collection by downward displacement of air (delivery tube near neck of flask).
DApparatus showing gas generation, drying with concentrated sulfuric acid in a wash bottle, and collection by downward displacement of air (delivery tube near neck of flask).
✓ Correct answer
C: Apparatus showing gas generation, drying with concentrated sulfuric acid in a U-tube, and collection by downward displacement of air (delivery tube near neck of flask).
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