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The colour of copper sulphate solution is:
AColourless
BYellow
CGreen
DBlue
Answer & Solution
Correct answer: D. Blue
1. Hydrated copper sulphate (CuSO₄·5H₂O) is a deep BLUE crystalline solid.
2. Its aqueous solution is also blue, due to the [Cu(H₂O)₆]²⁺ ion.
3. Anhydrous CuSO₄ is colourless/white — a moisture detector!
_Source: NCERT Class 10 Science Ch 1 §1.2.3 (Zn-CuSO₄ activity)_
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