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Question

How many hydrogen-bonded water molecules are associated with CuSO4.5H2O?


A

Five

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B

One

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C

Four

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D

Three

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Solution

The correct option is B

One


The explanation for the correct option:

Option (B):one

  • In the case of CuSO4.5H2O,only four molecules of water are directly bonded or coordinated to Cuwhereas the fifth one is H-bonded to Sulfate ion.
  • Here, the fifth water molecule which is hydrogen-bonded is deeply embedded in a crystal, for which It is not coordinated directly to the Cu, which can be shown as;
solution
  • Hence, only 4 water molecules are directly coordinated and one of them is hydrogen-bonded to the moleculeCuSO4.5H2O.

Thus, the number of hydrogen-bonded water molecules associated with CuSO4.5H2O is one, option (B) is the correct answer.


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