Reaction with Alcohol
- K₂Cr₂O₇ in acidic solution acts as a strong oxidising agent.
- When alcohol is added to acidified K₂Cr₂O₇:
- The alcohol is oxidised to acetaldehyde.
- The dichromate ion is reduced to Cr³⁺.
- Observation: A distinct colour change occurs from orange‑red to green.
Reaction with Sulfur Dioxide
- When sulfur dioxide gas is passed through acidified K₂Cr₂O₇:
- Sulfur dioxide acts as a reducing agent.
- The dichromate ion is again reduced to Cr³⁺.
- Observation: The solution changes colour from orange to green.
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