How does liquid conduct electricity?

No, pure water is actually a poor conductor of electricity, for one.

because it is not an ion so it has a net charge due to which it doesn't conduct electricity it has covalent bonding

Liquid conduct Electricity due to the presence of ions in liquid or due to the ability of liquid molecules to split in ions.

Although it's not the whole story, the main fact is that in some liquids there exists charge carriers that are able to move almost freely troughout the liquid and thus conduct electricity. For...

Iron melts and becomes liquid at an 2800 degrees Fahrenheit. It can still conduct electricity, but, like all conductors, it conducts better at lower temperatures.