Which is the most correct meaning of water of crystallisation?
Answer and explanation
Correct answer: A fixed amount of water present in crystals of a salt
Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of some hydrated salts. It is part of the crystal structure, not merely moisture or dissolved water. For example, CuSO4·5H2O contains five water molecules per formula unit, while washing soda is Na2CO3·10H2O. Thus option A gives the correct meaning; B, C and D describe unrelated substances or situations.
Frequently asked questions
What is the correct answer to this question?
A fixed amount of water present in crystals of a salt
Why is this the correct answer?
Water of crystallisation is the definite number of water molecules chemically associated with one formula unit of some hydrated salts. It is part of the crystal structure, not merely moisture or dissolved water. For example, CuSO4·5H2O contains five water molecules per formula unit, while washing soda is Na2CO3·10H2O. Thus option A gives the correct meaning; B, C and D describe unrelated substances or situations.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
