A rock sample was added to cold dilute HNO3. The gas evolved was passed into...

JAMB 2002

A rock sample was added to cold dilute HNO3. The gas evolved was passed into a solution of acidified K2Cr2O7 and the solution turned green. The sample contains

A. Cl^-
B. NO₃^-
C. SO₃^2-
D. SO₄^2-

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Correct Answer: Option C

Explanation

Sulphur dioxide reacts with potassium dichromate and sulphuric acid to produce potassium sulphqqqqqqqqqqqqqqqate, chromium(III) sulfate and water and the solution turns from orange to green.

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