Correct Answer: Option C

Explanation

Sulphur dioxide (SO₂) gas will turn an orange solution of acidified potassium dichromate (K₂Cr₂O₇) clear green. This colour change occurs because sulphur dioxide is a reducing agent, and it reduces the dichromate ion (Cr₂O₇²⁻) from its orange form to the green chromium(III) form (Cr³⁺). 

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