Q.Write the following for the complex $[Ag(NH_3)_2]^+$.

$[Ag(NH_3)_2]^+$ has two neutral $NH_3$ ligands coordinated to a central $Ag^+$ ion; its IUPAC name is diamminesilver(I) ion.

1. Ligand: The species bonded to the central metal ion is ammonia, $NH_3$. It is a neutral molecule that donates its nitrogen lone pair to the metal, making it a neutral, monodentate ligand. In this complex there are two such $NH_3$ ligands.
2. Central metal ion: The metal at the centre of the complex is silver. Since the overall complex ion carries a $+1$ charge and both $NH_3$ ligands are neutral, the silver must be present as $Ag^+$, i.e. silver in the $+1$ oxidation state, with a coordination number of 2 (linear geometry, typical for $Ag(I)$ complexes with two ligands).
3. IUPAC name: Following the IUPAC rules for naming coordination complexes:

• Ligands are named first, in alphabetical order, with neutral ammonia named as 'ammine'; since there are two of them, the multiplying prefix 'di' is used: 'diammine'. …