Question

Which of the following is (are) property of a diamond?

• A. It is the hardest substance
• B. has high refractive index
• C. Like metals, it can conduct electricity
• D. In diamond each C is at the centre of tetrahedron

Answer 1

Answer: (A), (B), (D)

The correct options are
A has high refractive index
B It is the hardest substance
D In diamond each C is at the centre of tetrahedron

Carbon in diamond form cannot conduct electricity, while carbon in graphite form is a good conductor of electricity.

Diamond is so hard due to its chemical structure of carbon atoms that are arranged in a lattice giving it a giant covalent structure with great forces of attraction.
It also has high refractive index.