| Q.4 | Which of the following statements about diamonds is INCORRECT? | |
| Ans | 1. Diamonds can be synthesised by subjecting pure carbon to very high pressure and temperature. | |
| 2. Diamond is one of the hardest substances known to mankind. | ||
| 3. In diamonds, each carbon atom is bonded to three other carbon atoms forming a rigid three-dimensional structure. | ||
| 4. Diamonds have the same chemical properties as graphite. |
Correct Ans Provided: 3