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HCl is a molecular compound, but when it dissolves in water, there is a strong interaction between the hydrogen and chlorine atoms of HCl and the oxygen and hydrogen atoms of water molecules. This interaction results in the so-called ionization of HCl, whereby HCl molecules break apart and form ions in the solution. #Step 3: Ionization of HCl in water#

As HCl dissolves in water and ionizes to form positively charged hydronium ions and negatively charged chloride ions, it creates a solution with a high concentration of mobile charge carriers. These ions can move freely through the solution, allowing electric charges to be transferred from one point to another. This results in the HCl solution being an excellent conductor of electricity. In conclusion, the reason why an HCl solution in water is an excellent conductor of electricity is the ionization process that occurs when HCl dissolves in water, producing a significant amount of ions that can carry electric charges through the solution. Even though HCl is a molecular compound, its interaction with water leads to ion formation, which enables the resulting solution to conduct electricity efficiently.