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Question

Which of the following statements is incorrect for the coordination compound
K2[Cr(NO)+(NH3)(CN)4] :

A
Its IUPAC name is pottassium amminetetracyanidonitrosoniumchromate(I)
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B
Its spin only magnetic moment is 8 BM
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C
Its hybridization is d2sp3
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D
It exhibits geometrical isomerism
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Solution

The correct option is B Its spin only magnetic moment is 8 BM
The name of the complex is pottassium amminetetracyanidonitrosoniumchromate(I).
In this complex Cr is in a +1 oxidation state and CN is a strong field ligand. So, electrons will be paired up and hybridisation will take place as given below.

One e is unpaired in the 3d subshell so the magnetic moment = 1(1+2)=3 BM.
The complex can either be in the cis or trans form, so it exhibits geometrical isomerism.

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