Chemistrymedium · Past Paper
Copper sulfate crystals turn white on heating because:
AThey decompose
BThey lose water of crystallization
CThey react with oxygen
DThey turn into copper oxide
✓ Correct Answer: B — They lose water of crystallization
Heating $CuSO_4.5H_2O$ (blue) removes the water molecules, leaving anhydrous $CuSO_4$ (white).
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