Question

At low temperature hydrogen is which type of molecular solid?

Answer 1

Hint: For this question we must have the knowledge of the types of solid formed. At room temperature hydrogen is gas but at lower temperature it will form solid and hydrogen is non polar in nature.

Complete step by step solution:
Solids are classified into two types, crystalline solid and amorphous solids.
Crystalline solid are those which have regular arrangements of atoms or ions in the crystal structure. They are further classified into four parts as:
1.Ionic solids: they are those solids which are made up of ions. They are hard and act as an insulator in solid state but conduct electricity in liquid or aqueous phase. Some examples are common salt, magnesium oxide etc.
2.Metallic solids: As the name suggests the constituents particles are metals in this. They are conductor in both solid and molten state.
3.Covalent solids are those solids which have covalent networks, they are very giant molecules. The examples are diamond and graphite.
4.Molecular solids: The constituent particles are molecules and they are further classified as
Non polar molecular solids, polar molecular solids and hydrogen bonded molecular solids.
Non-polar molecular solids: they are formed by non-polar molecules. They are soft and do not conduct electricity.
Since hydrogen is a non polar molecule because of presence of same atoms and hence, is a part of non polar molecular solid.

Note: we can get solid hydrogen by decreasing the temperature below hydrogen melting point and also pressure is applied to hydrogen to change its state from gas to solid. Solid hydrogen was first observed by James Dewar in 1899.