A solution of CuSO4 in water is in what colour?

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Pink

Blue

Colourless

Green

answer is B.

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Detailed Solution

Concept- Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products.
When we dissolve copper sulphate in water, it reacts with it to form copper sulphate again. But now this copper sulphate is hydrated in form and now it has 5 molecules attached to it.
The chemical reaction for it will be:
CuSO4 + H2O 🡪 CuSO4.5H2O
Copper sulphate in anhydrous form is of pale green colour whereas, when it reacts with water, it becomes blue turning the whole solution into blue colour.
Hence, the correct answer is option (2).

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