Question

From below which is the example of insulators.

• A. Metallic elements
• B. Non Metallic elements
• C. graphite
• D. acqueous solution of salt

Answer 1

The correct option is B Non Metallic elements

Metallic elements have free electrons on the metallic surface and thus they are extremely good conductors.

Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Graphite is structured into planes with tightly bound atoms. There is a great deal of distance between planes, and they are bonded weakly together, allowing the electrons to move around.

When a salt is added in water, it dissociates into respective ions and these collect on the cathode and anodes respectively and a current is maintained.

Hence it is a conductor.