Choose the complex having the IUPAC name sodium hexanitrito -N- cobaltate(III):

N a_{3} [C o (N O_{2})_{6}]

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N a_{2} [C o (N O_{3})_{6}]

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N a [C o (N O_{2})_{6}]

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N a_{3} [C o (N O)_{6}]

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Solution

The correct option is A $N a_{3} [C o (N O_{2})_{6}]$
By the name sodium hexanitrito -N- cobaltate(III), there should be 6 nitrito $(- N O_{2})$ groups and the colbalt should be in its +3 oxidation state. So the correct answer is $N a_{3} [C o (N O_{2})_{6}]$

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[C o C l (O N O) (e n)_{2}]^{+}

[C o (N O_{2}) (N H_{3})_{5}] C l_{2}

IUPAC name of Na₃[Co(NO₂)₆] is:

N a_{3} [C o (N O_{2})_{6}]

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