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# The IUPAC name of the complex $[CO(NO_2)(NH_3)_5]Cl_2$ is

$\begin{array}{1 1}(a)\;\text{Nitrito-N-pentaammine cobalt (III) chloride}\\(b)\;\text{Nitrito-N-pentaammine cobalt (II) chloride}\\(c)\;\text{Pentaammine nitrito-N-cobalt (II) chloride}\\(d)\;\text{Pentaammine nitrito-N-cobalt (III) chloride}\end{array}$

The IUPAC name of the complex $[CO(NO_2)(NH_3)_5]Cl_2$ is Pentaammine nitrito-N-cobalt (III) chloride
Hence (d) is the correct answer.