What is the oxidation state of cobalt in the complex $[Co(NH_3)_6]^{3+}$?

  • A
    $+4$
  • B
    $+3$
  • C
    $+2$
  • D
    $+6$

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The oxidation state of cobalt in the complex compound $[Co(NH_3)_6]Cl_3$ is

The $IUPAC$ name of the complex $\left[Pt\left(NH_{3}\right)_{2} Cl\left(NH_{2} CH_{3}\right)\right] Cl$ is:

The oxidation number of cobalt in $K[Co(CO)_4]$ is
$(i)$ $+1$ $(ii)$ $+3$ $(iii)$ $-1$ $(iv)$ $-3$

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