A compound has high melting and boiling points. When in solid state, it does not conduct electricity. When it is melted, the molten compound conducts electricity. What type of compound is it? What are the constituent units of this compound?

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Solution

The compound mentioned here is an ionic compound. They contain ions as constituents. These ions are tightly bound to each other due to the strong coulombic force of attraction. As a result, the melting and boiling points of such compounds are very high.
Solid ionic compounds are insulators at normal temperatures because they do not conduct electricity. This is because the constituent ions are fixed in their locations in the solid state. In the molten state, ions get free in the solution, these free ions can move around freely in the melt solution and conduct electricity. Therefore, ionic compounds conduct electricity when dissolved in water or melted.
Therefore, the compound is an ionic compound and ions are their constituent units.

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