Question

Why do cut apples take up a brown colouration when exposed in air​

Answer 1

This brown colouration is due to iron. As we know that Apple is a fruit which is rich in iron therefore when it comes in the contact of air, brown colouration happens

Answer 2

$it \: is \: because \: of \: the \: oxidation \\ \: reaction \: taking \: place \: on \: the \: \\ surface \: of \: the \: fruit. \: the \: skin \\ \: of \: fruits \\ \: acts \: as \\ \: a \: barrier \\ \: from \: surrounding \: air \: but \\ \: when \: the \: skin \: is \: either \: cut \\ \: or \: broken \: the \: cell \: wall \\ \: gets \: ruptured \: and \: an \: enzyme \\ \: present \: in \: them \: reacts \: with \: the \: \\ oxygen \: present \: in \: the \: air.$

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