A)When aluminium is dipped in nitric acid a layer of aluminium oxide is formed on the metal. This happens because nitric acid is a strong oxidizing agent. The layer of aluminium oxide prevents further reaction of aluminium. Due to this, the reactivity of aluminium decreases.
B)Sodium and magnesium have higher affinity towards oxygen than towards carbon because these are highly reactive metals. Hence, carbon cannot reduce the oxides of Na or Mg.
C)Ionic compounds do not conduct electricity in solid state but they conduct electricity in aqueous solution and in molten state. Hence, this property is shown by sodium chloride.
D)Iron articles are galvanized to prevent rusting of iron. After galvanization, the layer of zinc works as protective layer.
E)Metals; like Na, K, Ca and Mg are highly reactive metals and hence they are not found in their free state in nature.
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