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During the preparation of ferrous ammonium sulphate (Mohr's salt, FeSO₄·(NH₄)₂SO₄·6H₂O), prolonged heating is avoided.
This is because Fe²⁺ ions are easily oxidized to Fe³⁺ ions when heated in the presence of air and water. Prolonged heating would cause oxidation of ferrous (Fe²⁺) to ferric (Fe³⁺) ions, which would contaminate the product.
The correct answer is Option 4: Prevent oxidation.
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