Question

The I.U.P.A.C name for $K_3\left[Co{\left(N{O}_2\right)}_6\right]$ is :

• A. Potassium(I) hexanitrocobaltate (II)
• B. Potassium(I) hexanitrocobaltate (IV)
• C. Potassium hexanitrocobalt (0)
• D. Potassium hexanitritocobaltate (III)

Answer 1

The correct option is D Potassium hexanitritocobaltate (III)

Option (D) is correct.

The I.U.P.A.C name for $K_3\left[Co{\left(N{O}_2\right)}_6\right]$ is Potassium hexanitritocobaltate (III).

In this complex, there are six $N{O}_2^{-}$ so they are named as hexanitrito. The complex has -3 charge, so the name of central metal atom ends with -ate followed by the charge in roman letters.

Thus, the name of the complex is Potassium hexanitritocobaltate (III).