The chemical reaction between the two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) Potassium dichromate solution and sulphur dioxide
(b) Potassium permanganate solution and sulphur dioxide
(c) Potassium permanganate solution and lemon juice
Potassium dichromate solution and carbon dioxide

Question

The chemical reaction between the two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a)	Potassium dichromate solution and sulphur dioxide
(b)	Potassium permanganate solution and sulphur dioxide
(c)	Potassium permanganate solution and lemon juice
Potassium dichromate solution and carbon dioxide

Accepted Answer

Option (a) is the answer. Reaction between potassium dichromate and sulphur dioxide is characterised by change in colour. The orange colour of acidified potassium dichromate will change into green by passing sulphur dioxide

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