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                                    Identify the substance that are oxidised and the substances that are redured in the following reactions. (i) 4Na(S)+O_(2)(g)rarr2Na_(2)O(S) (ii) CuO(S)+H_(2)(g)rarrCu(S)+H_(2)O(l) | 
                            
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Answer» SOLUTION :(i) Sodium is LOSING the electrons to oxygen, so it is oxidised. Oxygen is GAINING the electrons, so it is reduced.  (ii) `H_(2)`is oxidised into water. CuO is reduced to Cu metal.  | 
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