Question

Non-metals are generally non -counductors of electricity.Graphite is a non-metal but used as electrodes in batteries.Why?

Answer 1

Non metals don't conduct electricity and heat. But graphite is used as electrodes in bateries because it is a exception.
Since graphite have free mobile electrons therefore they conduct electricity.
Carbon is a non metal and graphite and diamond are form of it.
Since these shows some properties of metals, therefore graphite conduct electricity and diamond conduct heat.

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