What causes the blue colour of copper sulphate crystals?
Answer and explanation
Correct answer: Water of crystallisation
Hydrated copper sulphate crystals are represented as CuSO₄·5H₂O. The fixed water molecules in this crystalline structure are called water of crystallisation and are associated with the characteristic blue appearance of the hydrated salt. Sodium ions are absent, and chlorine or hydrogen gas is not responsible for the colour. Therefore option A is the intended correct answer.
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What is the correct answer to this question?
Water of crystallisation
Why is this the correct answer?
Hydrated copper sulphate crystals are represented as CuSO₄·5H₂O. The fixed water molecules in this crystalline structure are called water of crystallisation and are associated with the characteristic blue appearance of the hydrated salt. Sodium ions are absent, and chlorine or hydrogen gas is not responsible for the colour. Therefore option A is the intended correct answer.
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.
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