Chemistry - Coordination Chemistry Question with Solution | TestHub
ChemistryCoordination ChemistryVBT,CFT(complex compound)Medium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
The coordination number of Ni²⁺ is 4.
NiCl₂ + KCN (excess) → A (cyano complex)
NiCl₂ + KCl (excess) → B (chloro complex)
Predict the magnetic nature of A and B .
Options:
Answer:
C
Solution:
Ni²⁺ has electronic configuration .
In excess CN⁻, A = [Ni(CN)₄]²⁻ is formed. CN⁻ is a strong-field ligand, so electrons pair up and the complex becomes square planar (dsp²) hence diamagnetic.
In excess Cl⁻, B = [NiCl₄]²⁻ is formed. Cl⁻ is a weak-field ligand, so the complex is tetrahedral (sp³) with 2 unpaired electrons.
Therefore, A is diamagnetic and B is paramagnetic with two unpaired electrons.
Answer: (C)
Stream:JEESubject:ChemistryTopic:Coordination ChemistrySubtopic:VBT,CFT(complex compound)
⏱ 2mℹ️ Source: QB
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