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In solid CuSO4.5H2O, which contains covalent, ionic and coordinate bonds, how many coordinate bonds does the copper centre form with water molecules?

1. 1
2. 2
3. 3
4. 4

Correct answer: 4

Solution

Cu2+ in CuSO4.5H2O is surrounded by four water molecules that each donate an electron pair, so copper forms four coordinate bonds with water.

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