IUPAC name $N a_{3} [C o {(O N O)}_{6}]$ is

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Sodium hexanitrocobalt (III)

Sodium hexanitrito cobaltate (III)

Sodium hexanitritocobaltate (II)

Sodium cobaltinitrite

answer is B.

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Detailed Solution

According to the rules of IUPAC nomenclature,
1. The cation is named first in both positively and negatively charged coordination entities.
2. The ligands are named in an alphabetical order before the name of the central atom/ion.

In the given complex- ${Na}_{3} [Co {(ONO)}_{6}];$ 'Sodium' word written first in the given IUPAC nomenclature. ONO- is nitrito, as there are six ONO-therefore, nitrio is also written as hexanitrito. Co is the central metal atom and having +3 oxidation state, cobaltate (III) is written after hexanitrito.

Therefore, the name of the complex is sodium hexanitrito cobaltate (III).

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