12. Reactivity of aluminium decreases if it is dipped in nitric acid explain.
Metal like Calcium and magnesium are never found in their free state.
Explain sodium chloride is an ionic compound which does not conduct
electricity in solid state whereas it does conduct electricity in molten
state as well as in aqueous solution. CBSE-31/1/3
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This happens because nitric acid is a strong oxidizing agent. The layer of aluminium oxide prevents further reaction of aluminium. This is the reason why the reactivity of aluminium decreases. (b) Sodium and magnesium have tendency to react with oxygen rather than carbon because these are highly reactive metals.
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