Surface Chemistry - Result Question 6

####6. The number of water molecule(s) not coordinated to copper ion directly in $CuSO _4 \cdot 5 H _2 O$, is

(2019 Main, 9 April I)

(a) 2

(b) 3

(c) 1

(d) 4

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Answer:

Correct Answer: 6. (c)

Solution:

  1. In $CuSO _4 \cdot 5 H _2 O$, one molecule of water is indirectly connected to $Cu$. In this molecule, four water molecules form coordinate bond with $Cu^{2+}$ ion while one water molecule is associated with H-bond with $SO _4^{2-}$.

Structure of $CuSO _4 \cdot 5 H _2 O$

$\left[Cu\left(H _2 O\right) _4\right] SO _4 \cdot H _2 O$



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