Question

List -I List -2
A. IVA group 1. Crystalline form
B. Onyx 2 Amorphous form of silica
C. Lubricant 3. Graphite
D. Hardest material 4.ns2 np2
5. Diamond
The correct match with A B C D is ?

• A. 2 4 3 5
• B. 2 3 5 4
• C. 4 2 3 5
• D. 5 3 2 4

Answer 1

The correct option is C 4 2 3 5

IV A Group has 4 valence electrons and are arranged as $n{s}^2$ $n{p}^2$.
Onyx is the amorphous form of silica.
Diamond is one of the hardest materials due to the strong covalent bonds which connect various atoms in the lattice.
Graphite is used as a lubricant due to the weak bonding between its layers, which allows the layers to slide on one another.