When acetaldehyde is oxidised with acidified potassium dichromate, it forms _____(ester/ethanol/acetic acid)

Explanation

To solve the question, we need to understand the oxidation of acetaldehyde when it reacts with acidified potassium dichromate.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant is acetaldehyde, which has the chemical formula CH₃CHO.

2. **Identify the Oxidizing Agent**:
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