Q.

Which of the following statements is not true for the reaction given belolw?CuH2O62++4NH3⇌CuNH342++4H2O

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a

It is a ligand-substitution reaction

b

NH3 is a relatively strong-field ligand while H2O is a weak field ligand

c

During the reaction, there is a change in colour from light blue to dark blue.

d

CuNH342+ has a tetrahedral structure, and is  paramagnetic

answer is D.

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Detailed Solution

H2O and NH3 ligand are substituted so it is a ligand substitution reaction. NH3 is powerful ligand (strong field than H2O) and hence capable of pairing. Thus [Cu(NH3)4]2+ is no more tetrahedral it turn to be square planar complex.
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