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Give a chemical test to distinguing betw...

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

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Butter and cooking oil can be distinguished by using alkaline `KMnO_(4)` Being unsaturated only cooking oil decolourises the pink bolour of alkaline `KMnO_(4)` where as 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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