Which of the following statements about diamond and graphite is true?
- AThey have same electrical conductivity.
- BThey have same crystal structure.
- CThey have same degree of hardness.
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (e) None of the above
Explanation
Diamond and graphite are allotropes of carbon but differ greatly in properties.
Diamond has a 3D tetrahedral lattice (very hard, non-conductor); graphite has layered sheets (soft, good conductor), so their hardness, crystal structure and conductivity all differ.