Question

From below which is the example of insulators.

A

Metallic elements

B

Non Metallic elements

C

graphite

D

acqueous solution of salt

Easy

Solution

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Correct option is B)

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.

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