(a) Calculate the coordination number of Co in $[Co(en)_3]^{3+}$. (b) Write the IUPAC name of $[Ag(NH_3)_2][Ag(CN)_2]$. (c) What is crystal field splitting?

**OR**

(d) Write the structures of the geometrical isomers of $[Co(NH_3)_3Cl_3]$. (e) Explain why $[Co(NH_3)_6]^{3+}$ is

Question

(a) Calculate the coordination number of Co in $[Co(en)_3]^{3+}$. (b) Write the IUPAC name of $[Ag(NH_3)_2][Ag(CN)_2]$. (c) What is crystal field splitting?

**OR**

(d) Write the structures of the geometrical isomers of $[Co(NH_3)_3Cl_3]$. (e) Explain why $[Co(NH_3)_6]^{3+}$ is an inner orbital complex, whereas $[Ni(NH_3)_6]^{2+}$ is an outer orbital complex. (Atomic nos. of Co and Ni are 27 and 28, respectively)

Accepted Answer

>

> [!TLDR]
> Coordination number counts donor atoms, not ligands, so a tris-chelate of a bidentate ligand gives CN = 6. Naming a double-complex salt requires naming both complex ions. Crystal field theory splits degenerate d-orbitals under a ligand field. (OR: [Co(NH₃)₃Cl₃] shows fac/mer geometrical isomerism; whether a complex is inner- or outer-orbital depends on the metal's d-electron count and the ligand's field strength.)
>
> **(a) Coordination number of Co in $[Co(en)_3]^{3+}$.**
> Ethylenediamine ($en = H_2N	ext{–}CH_2	ext{–}CH_2	ext{–}NH_2$) is a **bidentate** ligand — it donates through **two** nitrogen atoms per molecule. With **three** $en$ ligands attached to $Co$:
>
> $$	ext{Coordination number} = 3 	imes 2 = 6$$
>
> **(b) IUPAC name of $[Ag(NH_3)_2][Ag(CN)_2]$.** …

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