Which of the following are the substances whose reaction is characterised by a change in colour from orange to green?

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Potassium dichromate solution and sulphur dioxide

Potassium permanganate solution and sulphur dioxide

Potassium permanganate solution and lemon juice

Potassium dichromate solution and carbon dioxide

answer is A.

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Detailed Solution

Potassium dichromate solution and sulphur dioxide are the substances whose reaction is characterised by a change in colour from orange to green.
A colour change is observed when potassium dichromate solution reacts with sulphur dioxide. When sulphur dioxide is passed, the orange colour of acidified potassium dichromate changes to green. Potassium sulphate, chromium (III) sulphate and water are the products formed.

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