Chemistry
Give a chemical test to distinguish between the following gases:
Carbon dioxide and sulphur dioxide
Practical Chemistry
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Answer
Carbon dioxide has no effect on acidified KMnO4 or K2Cr2O7.
Sulphur dioxide turns KMnO4 from pink to clear colourless and K2Cr2O7 from orange to clear green.
2KMnO4 + 2H2O + 5SO2 ⟶ K2SO4 + 2MnSO4 + 2H2SO4
K2Cr2O7 + H2SO4 + 3SO2 ⟶ K2SO4 + Cr2(SO4)3 + H2O
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