Question

Hydrated salts are ___type of solutions.
(A) solid-liquid
(B) liquid-solid
(C) solid-solid
(D) solid-gas

Answer 1

Hint: As we know that the term hydra is known for water and salts are formed when any type of acid (strong or weak) and any type of base (strong or weak) react together such as NaCl is formed by NaOH (strong base) and HCl (strong acid). The salts are formed, have ionic force of attraction and exist as solid.

Complete answer:
When an acid and a base react together, they form their salt from the cation and anion force of attraction. These forces are known as ionic forces of attraction and these are very strong forces which make the salts in a crystalline form (arranged solid). The salts are formed by eliminating water but the water molecules are retained by crystals due to ion-dipole force of attraction.
The hydration term is used for the crystals which absorbs water molecules in the crystallisation such as the hydrated copper sulphate solution which is represented as \[{\rm{CuS}}{{\rm{O}}_{\rm{4}}} \cdot {\rm{5}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\] and prepared by sulphuric acid and cupric oxide.
Hence, we can say that hydrated salts are solid-liquid types of solutions.

The correct option is (A).

Note: Therefore, the solution of hydrated salts is solid-liquid type because the crystals of salts are solid and it is prepared by eliminating the water molecule but some of the water is retained so the solution is liquid.