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Question
What do you observe when Blue vitriol is heated?
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Solution
Blue vitriol is blue in colour as it contains 5 molecules of water of crystallization (CuSO4.H2O). When it is heated, it loses water of crystallization and becomes anhydrous CuSO4 which is grey-white in colour.
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| 1. | Blue vitriol | CaSO4.2H2O |
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| 4. | Hygroscopic | NaOH |
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