Short Answer TypeWrite the IUPAC name of the complex [Cr(NH3)4Cl2]+. What type of isomerism does it exhibit?
Write the IUPAC names of the following coordination compounds:
 (i) [Cr(NH3)3Cl3]
(ii) K3[Fe(CN)6]
(iii) [CoBr2(en)2]+, (en = ethylenediamine)Give the formula of each of the following coordination entities:
(i)Â Co3+ Ion is bound to one Cl-1 , one NH3Â molecule and two bidentate ethylenediamine (en) molecules.
(ii) Ni2+Â ion is bound to two water molecules and two oxalate ions. Write the name and magnetic behavior of each of the above coordination entities.
(At. No. Co = 27, Ni = 28)
Write the name, stereochemistry and magnetic behavior of the following:Â
(At. nos. Mn = 25, Co = 27, Ni = 28)Â
 (i) K4[Mn (CN)6]Â
 (ii) [Co (NH3)5Cl]Cl2
 (iii) K2[Ni (CN)4]
 Using IUPAC norms write the formulate for the following coordination compounds:
(i) Hexaamminecobalt (III) chloride
(ii) Potassium tetrachloridonickelate (II)
(a) Write the hybridization and shape of the following complexes:
(i) [CoF6]3–
(ii) [Ni (CN)4]2–
(Atomic number: Co = 27, Ni = 28)
(b) Out of NH3Â and CO, which ligand forms a more stable complex with a transition metal and why?
For the complex [NiCl4]2-, write
(i) The IUPAC name.
(ii) The hybridization type.
(iii) The shape of the complex.
(Atomic no. of Ni = 28)
What is meant by crystal field splitting energy? On the basis of crystal field theory, write the electronic configuration of d4 in terms of t2g and eg in an octahedral field when
(i)
0Â > P
(ii) 
0Â < P
Name of the following coordination entities and describe their structure:
(i) [Fe (CN)6]4-
(ii) [Cr (NH3)4Cl2]+
(iii) [Ni (CN) 4]2-
(Atomic numbers Fe = 26. Cr = 24, Ni = 28(i) [Fe (CN)6]4-
IUPAC name: Hexacyanoferrate (II)
Structure: Oxidation state of iron is + 2
Fe2+: Electronic configuration is 3d6 4s° 4p°
Orbitals of Fe2+Â ions:
 
As CN-Â is a strong field ligand, it causes the pairing of unpaired 3d electrons
 
Â
Since there are six ligands around the central metal ion, the most feasible hydrization is d2sp3.
d2sp2Â hybridized orbitals of Fe2+Â are:
 
Â
6 electron pairs from CN-1Â ions occupy the six hybrid d2sp3Â orbitals
Then,
 
Hence, the structure of [Fe (CN)6]4- is octahedral.
(ii) [Cr (NH3)4Cl2] +
Name: Tetraamminedichlorido chromium (III)
Electronic configuration of Cr: 3d4Â 4s2
Electronic configuration of Cr3+: 3d3
Â
 
Structure is octahedral with d2sp3Â hybridization.
(iii) [Ni (CN) 4]2-
Name: Tetracyanonickelate (II)
Structure: Here oxidation state of Ni is + 2
Ni + 2: Electronic configuration is 3d8Â 4s0Â 4p0
Orbitals of Ni2+Â ion
Â
 
As CN-1is a strong field ligand, it causes the pairing of unpaired 3d electrons.
 
Â
Since, there are four ligands around the central metal ion, the most feasible hybridization is dsp2
Â
 
4 electron pairs from CN-1 ions occupy the four hybrid dsp2 orbitals
Then,
 
Â
Hence, the structure of [Ni(CN)4]2- is square planar.
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