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Solution
The correct option is D Hexaamminecobalt(III) hexanitrito-O cobaltate(III)
Option (D) is correct. The I.U.P.A.C. name for [Co(NH3)6][Co(ONO)6] is hexaamminecobalt(III) hexanitrito-O cobaltate(III).
NH3 is neutral, making the first complex positively charged overall. ONO has a -1 charge, making the second complex the anion and it is bounded with cobalt with its O atom. As the charge on cobalt complex in the second part is -3 so it will end with -ate followed by the charge in roman letters.