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Explain the following: (a) Sodium chlo...

Explain the following:
(a) 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.
(b) Reactivity of aluminium decrease if it is dipped in nitric acid.
(c) Metals like calcium and magnesium are never found in their free state in nature.

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