Question

Which of the salt contain water of crystallization?

• A. Potash alum
• B. Plaster of paris
• C. Epsom salt
• D. All of these

Answer 1

The correct option is D

All of these

The explanation for the correct option:

(D) All of these

• Potash Alum - ${\mathrm{K}}_2{\mathrm{SO}}_4.{\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3.24{\mathrm{H}}_2\mathrm{O}$
• Plaster of Paris - ${\mathrm{CaSO}}_4.½{\mathrm{H}}_2\mathrm{O}$
• Epsom salt - ${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$
• The fixed amount of water that is associated with hydrated crystals which is an integral part of the crystal, is said to be the water of crystallization

The explanation for the incorrect option:

(A) Potash Alum - ${\mathrm{K}}_2{\mathrm{SO}}_4.{\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3.24{\mathrm{H}}_2\mathrm{O}$ it contains water of crystallization but the other two salts also contain water of crystallization

(B) Plaster of Paris -${\mathrm{CaSO}}_4.½{\mathrm{H}}_2\mathrm{O}$it contains water of crystallization but the other two salts also contain water of crystallization

(C) Epsom salt - ${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$ it contains water of crystallization but the other two salts also contain water of crystallization

Hence, Option (D) is correct, i.e, All of these. All of the given compounds contain water of crystallization.