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In this reaction, calcium is being oxidised. In 2Ca, its oxidaton state is 0 and after the reaction it is increased to +2 which forms a bong with oxygen ion. Since its oxidation state is increased from 0 to +2, it is being oxidised. Or you can look at it in another different manner. Calcium gains oxygen in the reaction thus it is being oxidised. It also loses electrons to form an ion which reacts with oxygen ion. Any substance is being oxidised when it oxidation state increases, gains oxygen atoms, loses hydrogen atoms or loses electrons.

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