Question

18. Explain the following:
(a) Sodium chloride is an ionic compound which
does not conduct electricity in solid state
where as it does conduct electricity in molten
in solid 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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Answer 1

Answer:

The ions in a compound such as sodium chloride are arranged in a lattice structure. ... Solid ionic compounds do not conduct electricity because the ions are held firmly in place. The ions cannot move to conduct the electric current . But when an ionic compound melts, the charged ions are free to move.

Explanation: