Question

Some salts while crystallising out from their solution, unite with a definite quantity of water which is known as _________.

• A. drying agent
• B. hygroscopic substance
• C. water of crystallisation
• D. efflorescence

Answer 1

The correct option is C

water of crystallisation

Some salts while crystallising out from their solution, unite with a definite quantity of water which is known as the water of crystallisation.This water of crystallisation is in loose chemical combination with the salts and it can be driven out by heating the powdered crystals of these salts above ${100}^{0}C$.