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NEET CHEMISTRYMedium

The number of hydrogen bonded water molecules(s) associated with CuSO₄·5H₂O is:

A

3

B

1

C

2

D

5

Step-by-Step Solution

  1. Analyze the Structure: Copper(II) sulphate pentahydrate (CuSO4⋅5H2OCuSO_4 \cdot 5H_2O) has a complex structure. The central Copper ion (Cu2+Cu^{2+}) is coordinated to 4 water molecules forming a square planar coordination entity: [Cu(H2O)4]2+[Cu(H_2O)_4]^{2+}.
  2. Identify Water Types:
  • 4 water molecules act as ligands, forming coordinate bonds with the copper ion.
  • The 5th water molecule acts as a bridge between the [Cu(H2O)4]2+[Cu(H_2O)_4]^{2+} cation and the SO42−SO_4^{2-} anion. It is held in the crystal lattice solely by hydrogen bonds.
  1. Conclusion: Therefore, only 1 water molecule is attached via hydrogen bonding, while the other 4 are coordinated.
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