Question

Why does apple Slice got brown colour if kept in air for long time? ​

Answer 1

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Why does apple Slice got brown colour if kept in air for long time? 

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Apples turn brown when exposed to air because of the oxidation process that goes on when the inside of the apple gets exposed to the ambient air which contains oxygen and water molecules. The skin of the apple protects it from this process. This oxidation process is very sensitive to the ambient temperature.