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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.

Text Solution

Verified by Experts

Due to the formation of a coating of aluminium oxide / `Al_(2)O_(3)`.
Detailed Answer :
On dipping aluminium in nitric acid, a layer of aluminium oxide is formed as nitric acide is a strong oxidizing agent. The layer of aluminium oxide prevents further reaction of aluminium due to which the reactivity of aluminium decreases.
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