The $I U P A C$ name for the complex $[C o (N O_{2}) (N H_{3})_{5}] C l_{2}$ is:

pentaamminenitrito-N-cobalt(III) chloride

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nitrito-N-pentaamminecobalt(III) chloride

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pentaamminenitrito-N-cobalt(II) chloride

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pentaamminenitrito-N-cobalt(I) chloride

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Solution

The correct option is A pentaamminenitrito-N-cobalt(III) chloride
Oxidation number of Co is $x - 1$ = 2 $\to$ x=3

Nitrogen is donating its lone pairs in the given compound.
The IUPAC name is pentaamminenitrito-N-cobalt(III) chloride.

Hence option A is correct.

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

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

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

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