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Give a chemical test to distinguish between butter and cooking oil.

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Give a chemical test to distinguish between butter and cooking oil.
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Butter and cooking oil can be distinguished by using alkaline KMnO4. Being unsaturated only cooking oil decolourises the pink colour of alkaline KMnO4 whereas butter does not because it is saturated. Bromine water test is also used where brown colour is discharged by the cooking oil.

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