Which is the correct IUPAC name of the complex [Ag(NH3)2][Ag(CN)2]?

The correct answer is Option (1) → Diamminesilver(I)dicyanidoargentate(I)

Both ions are named, cation first; the anionic silver takes the “-ate” name, argentate.

Find the oxidation state of silver in each ion:

    \( \displaystyle [\mathrm{Ag(NH_3)_2}]^{+}:\ x+2(0)=+1\ \Rightarrow\ x=+1 \)

    \( \displaystyle [\mathrm{Ag(CN)_2}]^{-}:\ x+2(-1)=-1\ \Rightarrow\ x=+1 \)

So the cation is diamminesilver(I) and the anion is dicyanidoargentate(I), and the name is diamminesilver(I) dicyanidoargentate(I).

Why the other options are incorrect

• Option (2) Diammineargentate(II)dicyanidosilver(I) — Incorrect. The “-ate” ending belongs to the anion, not the cation; and silver is +1 in both ions, not +2.

• Option (3) Diammineargentate(I)dicyanidosilver(II) — Incorrect. The “-ate” ending is given to the cation instead of the anion, and silver in the anion is +1, not +2.

• Option (4) Diamminesilver(II)dicyanidoargentate(II) — Incorrect. The order and endings are right, but silver is +1 in both ions, not +2.

NCERT (2026-27 edition):
Naming of Mononuclear Coordination Compounds – …

Note: The same/similar question has been asked in different years by NTA as per the details given below: