SCIENCE
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Silver
|
|
|
Diamond
|
|
|
Gold
|
|
|
Quartz
|
Detailed explanation-1: -The structure extends in space and produces a rigid 3-D network of carbon atoms with directional covalent bonds throughout the lattice. It is very difficult to break extended covalent bonding which makes diamond the hardest substance on the earth.
Detailed explanation-2: -Thus from the table hardness of the material next to Diamond is Cubic Boron Nitride (CBN).
Detailed explanation-3: -Lonsdaleite was found in a meteorite that scientists say came from a dwarf planet that was billions of years old. An asteroid crashed into that planet, releasing pressure that caused the stone to form. The hardness of lonsdaleite could be useful in making super durable tools for industrial sites.
Detailed explanation-4: -Diamond is composed of pure carbon and the atomic bonding of the atoms makes it the hardest material. Extremely strong bonding makes diamond hardest among all other substances, but there is one direction where the bonds are not as strong and a diamond can be cleaved along this direction with impact.