Write the balanced chemical equation for the following reactions: (i)When copper is heated in air. (ii) Reaction of sodium with water. (iii) Aluminium oxide reacts with sodium hydroxide.
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Explanation:
(i) 2Cu+O2(air)−→−Heat2CuO
(ii) 4Al+3(air)O2−→−Heat2Al2O3
(iii) Al2O3+2NaOH→2NaAlO2+H2O
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