Question

Write an example of a pair of isomorphous substances.

Answer 1

Hint: As we know that matters are divided into three types. There are solids, liquids and gas. Solids are divided into types. They are crystalline and amorphous. The crystalline is further divided into ionic solids, covalent solids, molecular solids and metallic solids. In crystalline solid, the basic repeating structural unit is called a unit cell.

Complete answer:
We have to know that in crystallography studies wise, the two crystals have similar in shape.These crystals are almost identical.These two crystals are known as isomorphous substances.
Sodium nitrate and calcium sulfate are good examples of isomorphous substances. Because both have similar structure and shape.
The isomorphous substances are also called double salt. All the double salts are not isomorphous substances. But all isomorphous substances are double salt.
The metal atom present in the complex is called the central metal atom. The atom which donate lone pairs of electrons to the central atom or the coordinate bond with the central atom is known as ligand.
In coordination chemistry concept wise, two ligands have the same and one central metal atom. Otherwise, one ligand has two central metal atoms. These kinds are also called isomorphous substances.
Alums are also called as isomorphous substances. Alums such as \[{\text{KAl(S}}{{\text{O}}_4}{{\text{)}}_{\text{2}}}\]. Here the sulphate ion has two central metal atoms.

Note:
We have to know that there are seven types of primitive crystal system. There are cubic, tetragonal, orthorhombic, hexagonal, monoclinic, triclinic and rhombohedral. This classification of crystals is based on the crystallographic nature of angles, unit cells, primitive lattice and axes. These cubic crystals are further divided into three types. There are simple cubic crystals, face centered cubic crystals and body centered cubic crystals. This classification is based on the atoms arrangement in the cubic structure in the unit cell.