How many hydrogen-bonded water molecules are associated with CuSO4.5H2O?
Five
One
Four
Two
In , Cu is coordinated with 4 water molecules. Now fifth water molecule is hydrogen-bonded and is deeply embedded in the crystal. It is not coordinated. Only 4 water molecules are coordinated and the fifth is only hydrogen bonded.
Only one water molecule, which is outside the brackets (coordination sphere), is hydrogen-bonded. The other four molecules of water are coordinated.
Therefore, Option(2) is correct