Question

Some substances are given below Ag: CO\(_2\) (s); SiO\(_2\) (s); ZnS (s) SO\(_2\) (s); A/N: HCl (s); H\(_2\)O (s) The number of molecular solids and network solids in the above list is respectively.

• A. 3, 3
• B. 2, 4
• C. 1, 4
• D. 4, 2

Hint:

Remember the basic properties of molecular and network solids.
- Molecular solids have low melting points and are soft.
- Network solids are hard and have high melting points due to strong covalent bonds.

Answer 1

The Correct Option is D

- Molecular solids are those which consist of discrete molecules held together by van der Waals forces. - Network solids are those where atoms are covalently bonded in a continuous network. From the list:
- Ag (Silver) is a metallic solid, so it is not counted. - CO\(_2\), SiO\(_2\), and ZnS are network solids.
- SO\(_2\), HCl, and H\(_2\)O are molecular solids.
Thus, the number of molecular solids is 2, and the number of network solids is 4.