Coordination Compounds 2 Question 46

####48. Amongst Ni(CO)4,[Ni(CN)4]2 and NiCl42

(1991, 1M)

(a) Ni(CO)4 and NiCl42 are diamagnetic and [Ni(CN)4]2 is paramagnetic

(b) [NiCl4]2 and [Ni(CN)4]2 are diamagnetic and Ni(CO)4 is paramagnetic

(c) Ni(CO)4 and [Ni(CN)4]2 are diamagnetic and [NiCl4]2 is paramagnetic

(d) Ni(CO)4 is diamagnetic and [NiCl4]2 and [Ni(CN)4]2 are paramagnetic

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Solution:

  1. In Ni(CO)4,Ni has 3d10-configuration, diamagnetic. In Ni(CN)4]2, Ni has 3d8-configuration but due to strong ligand field, all the d-electrons are spin paired giving dsp2-hybridisation, diamagnetic.

In[NiCl4]2, Ni has 3d8-configuration and there is two unpaired electrons (weak chloride ligand do not pair up d-electrons), hence paramagnetic.



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