Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound. But, both conduct electricity in their aqueous solutions. Explain.

Question: 

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound. But, both conduct electricity in their aqueous solutions. Explain.

Solution:

A solution conducts electricity due to the presence of charged ions. Potassium chloride is an electrovalent compound so it contains ions and can conduct electricity. Hydrogen chloride is a covalent compound but it is polar in nature so it ionises in its aqueous solution and since ions are present in the solution, it can conduct electricity.