What change may be seen in a hydrated salt when water of crystallisation is removed?
Answer and explanation
Correct answer: Its colour may change
The governing concept is that water of crystallisation can influence the structure and appearance of a salt. When this water is removed by heating, the hydrated salt may become anhydrous and its colour can change; for example, blue hydrated copper sulphate becomes white. Therefore option A is correct. Removal does not always convert a salt into a gas or metal, and a visible change is possible.
Frequently asked questions
What is the correct answer to this question?
Its colour may change
Why is this the correct answer?
The governing concept is that water of crystallisation can influence the structure and appearance of a salt. When this water is removed by heating, the hydrated salt may become anhydrous and its colour can change; for example, blue hydrated copper sulphate becomes white. Therefore option A is correct. Removal does not always convert a salt into a gas or metal, and a visible change is possible.
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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