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O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2010 · Q251 Mark

Sulfur is burnt in air. Which statement about this reaction is correct?

ASulfur is oxidised to sulfur trioxide.
BThe gas formed turns aqueous potassium dichromate(VI) from orange to green.
CThe reaction is reversible.
DThe reaction needs a catalyst.

✓ Correct answer

B: The gas formed turns aqueous potassium dichromate(VI) from orange to green.

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About this question

Topic
Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2010 Paper 1 Variant 1, question 25.

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