The correct statement about the colour of is:

Question

The correct statement about the colour of  is:

Canvas Classes · Accepted Answer

— Blue colour:

- :  (1 unpaired electron)
- In : Cu²⁺ is surrounded by 4 water molecules as ligands (square planar) + 1 water of crystallisation
- Water () is a weak field ligand that causes d-orbital splitting
- Visible light absorbed for  transition → blue colour ✓

Anhydrous  is white/colourless — without water ligands, there is no crystal field splitting and hence no visible  transition.

This is why anhydrous  is used as a test for water — it turns blue upon absorbing moisture.

Answer: Op

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