Co – ordination Compounds JEE Main 2023 shift – II with solution

Question :

The IUPAC name of K₃[Co (C₂O₄)₃] is

Options :

(a) Potassium trioxalatocabaltate(III)

(b) Potassium tris(oxalato)cobalt (III)

(c) Potassium tris(oxalato) cobaltate (III)

(d) Potassium trioxalatocobalt (III)

Co – ordination Compounds JEE Main 2023 shift – II with solution

Answer :

Steps required to find IUPAC

1. Identify the cation and anion : The Compound consists counter ions as Potassium [ K³⁺] and complex ions as [Co (C₂O₄)₃]
2. Naming of cation as Potassium
3. Naming of ligand : The ligand C₂O₄^-2 called oxalato which does not contain any numerical value so, for simple ligands we use di, tri etc
4. Number of ligands present in oxalato is Three. we use trioxalato
5. Central metal atom : Since complex ion is negative , the metals ends with ate. cobalt → cobaltate
6. Oxidation state of the central atom ion is denoted by Roman numeral

Oxidation number of Co in K₃[Co (C₂O₄)₃] = 3(+1) + x + 3( – 2) = +3

IUPAC : Potassium trioxalatocabalate(III)

Correct answer : Option (a)

Practice Questions :

1. IUPAC name of K₄[Fe(CN)]₆ is

Cation $\rightarrow$ Potassium [ k⁴⁺]

Anion $\rightarrow$ [Fe(CN)]₆

2. Number of ligands present in K₄[Fe(CN)]₆ : 6

3. Naming of ligands CN $\rightarrow$ hexacyano

4. Naming the central metal atom : Since complex ion is negative , the metals ends with ate. Fe $\rightarrow$ Ferrate

5. Oxidation state of fe in K₄[Fe(CN)]₆ is 4(+1) + x + 6(-1) = +2

IUPAC : Potassium hexacyano ferrate (II)

2. The IUPAC of K₃[Co (C₂O₄)₃]

Cation $\rightarrow$ K³⁺

Anion $\rightarrow$[Co (C₂O₄)₃

Oxidation state of Central metal atom :

3(+1) + x + 3(-2) = +3

IUPAC : Potassium trioxalato cabaltate (III)

3. The IUPAC of [ Fe(CN)₆]^-4

anionic complex $\rightarrow$ [ Fe(CN)₆]^-4

Oxidation state of Central metal atom :

x + 6(-1) = -4

x = +2

IUPAC : hexacynoferrate(II) ion

4. The IUPAC of [Co(pph₃)₃]Cl₃

Cation $\rightarrow$ [Co(pph₃)₃]

Anion $\rightarrow$ Cl₃

Oxidation state of Central metal atom :

x + 3(0) + 3(-1) = +3

IUPAC : tris(triphenylphosphine) cobalt (III) Chloride

5. The IUPAC of [ Co (en)₃]³⁺

Cationic complex : [ Co(en)₃]³⁺

Oxidation state of central metal atom :

x + 3(0) = +3

IUPAC : tris(ethylene diamine) cobalt (III) ion

6. The IUPAC of [Ag (NH₃)₂][Ag(CN)₂]

Cation $\rightarrow$ [Ag(NH₃)₂]

Anion$\rightarrow$ [Ag(CN)₂]

Oxidation state of Central metal atom :

x + 2(0) + x + 2(-1) = 0

2x – 2 = 0

x = +1

IUPAC : diammine Silver(I) dicyanoargenate(I)

7. The IUPAC of [Ni(CO)₄]

Neutral complex $\rightarrow$ [Ni(Co)₄]

Oxidation state of central metal atom :

x + 4(0) = 0

x = 0

IUPAC : tetracarbonyl nickel(0)

8. The IUPAC of K₂[HgI₄]

Cation $\rightarrow$ K²⁺

Anion $\rightarrow$[HgI₄]

Oxidation state of central metal atom :

2(+1) + x + 4(-1) = 0

2 + x -4 = 0

x = +2

IUPAC : Potassium tetra iodo mercurate (II)

9. The IUPAC of [ Co(NH₃)₅Co₃]Cl

Cation $\rightarrow$ [ Co(NH₃)₅Co₃]

Anion $\rightarrow$ Cl

Oxidation of central atom :

x + 5(0) -2 + (-1) = 0

x – 3 = 0

x = +3

IUPAC : penta ammine carbonato cabalt (III) Chloride

10. The IUPAC of [Co(NH₃)₆]Cl₃

Cation $\rightarrow$ [Co(NH₃)₆]

Anion $\rightarrow$ Cl₃

Oxidation of central metal atom :

x + 6(0) = +3

x = +3

IUPAC : hexa ammine coblat (III) chloride

11. The correct IUPAC name of [ Pt Br₂ (Pme₃)₂] is

Netural complex $\rightarrow$ [ Pt Br₂ (Pme₃)₂]

Oxidation state of central metal atom :

x + 2 (-1) + 2(0) = 0

x = +2

IUPAC : dibromobis (trimethylphosphine) platinum (II)

12. IUPAC name of [pt(NH₃)₂ Cl (NH₂ CH₃) Cl

Cation $\rightarrow$ [pt(NH₃)₂ Cl (NH₂ CH₃)

Anion $\rightarrow$ Cl

Oxidation state of central metal atom :

x + 2(0) -1 + 0 -1 = +2

x = +2

IUPAC : diammine chloro (methanamine) Platinum (II) chloride

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