a piece of a appleturns brown when its is exposed to air for some time
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Apple contains iron content
when kept in atmosphere iron reacts with moisture and oxygen to form rust which is brown in colour
2Fe+ O2+ H2O ------> Fe2O3 + H2
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It is because of large quantity of iron is present in the apple and when it comes in the contact with air it becoms brown.
like rusting of iron when iron comes in the contact of air (oxygen).
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