NiCl 2 
complex A
NiCl 2 
complex B
A & B complexes have the co-ordination number 4.
(i) The IUPAC name of complexes ‘A’ & ‘B’ are respectively :
Text Solution
Verified by Experts(i) (i); (II) (ii)
(i)
(i) NiCl 2 + 4KCN (excess) 
K 2 [Ni(CN) 4 ] + 2KCl
Potassium tetracyanonickelate(II)
(ii) NiCl 2 + 2KCl (excess) 
K 2 [Ni(Cl) 4 ]
Potassium tetrachloronickelate( ΙΙ )
(ii) Refer above solutions.
(iii) In cyano complex, K 2 [Ni(CN) 4 ], complex ion is [Ni(CN) 4 ] 2– and Ni is present as Ni 2+ or Ni (II) and CN – is strong field ligand. Thus it compels for pairing of electrons. So,
Ni 2+ 
[Ni(CN) 4 ] 2– 
It does not contain unpaired electron. So it is diamagnetic in character and has square planar geometry.
In chloro complex, K 2 [Ni(Cl) 4 ], complex ion is [Ni(Cl) 4 ] 2– and Ni is present as Ni 2+ or Ni (II) and Cl – is weak field ligand. So,
Ni 2+ 
[Ni(Cl) 4 ] 2– 
It contains two unpaired electrons. So it is paramagnetic in character and has tetrahedral geometry.
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