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(D) Combustion is a chemical process in which a substance reacts rapidly with an oxidant (usually oxygen) and gives off heat. $(a)$ Oxidation of coal

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Lighting of an electric lamp

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(D) Combustion is a chemical process in which a substance reacts rapidly with an oxidant (usually oxygen) and gives off heat. $(a)$ Oxidation of coal in air is a combustion reaction. $(b)$ Burning of magnesium in nitrogen is a combustion reaction (forming $Mg_3N_2$). $(c)$ Reaction of antimony in chlorine is a combustion reaction (forming $SbCl_3$). $(d)$ Lighting of an electric lamp is a physical process involving the heating of a filament,not a chemical combustion reaction.

One of the phenomena which cannot be described as combustion is

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