Question

Which of the following is not a property of graphite?

• A. It is very hard
• B. It is a good conductor of electricity
• C. It has a metallic lusture.
• D. It is grey in colour

Answer 1

The correct option is A

It is very hard

Explanation for the correct option :

(A) It is very hard: Graphite is very soft and greasy to touch. That is why it is used as a lubricant. So hardness is not the property of graphite.

Explanation for the incorrect option :

(B) It is a good conductor of electricity: In the structure of graphite, one carbon is covalently bonded to three other carbon atoms in a hexagonal array. So, one electron per carbon atom is free. These free electrons per every carbon atom is free for conduction of electricity.

(C) It has a metallic luster: Graphite has a metallic luster as its physical property.

(D) It is grey in colour: It is blackish grey in colour.

Thus, option (A) is the correct option.