Question

apple and some another fruits turn brown when cut surface is exposed to air?​

Answer 1

Answer:

Apple contains iron. When its cut surface  is exposed to air, it reacts with oxygen and form iron oxide and hence turns brown.

Answer 2

Answer:

Apples and other fruit turn brown once the cut surface is exposed to air due to a reaction with oxygen in the surrounding air, a chemical reaction called oxidation

Explanation:

Fruit turns brown when exposed to air because a reaction is happening when a cut piece of fruit is exposed to oxygen. ... The chemical reaction can be simplified to: Polyphenol Oxidase + O2 → Melanin (Brown Color) Oxygen activates the compound polyphenol oxidase in the fruit to turn the fruit brown.

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