Question

Match the complex in List-I with the oxidation number of Co given in List-II.

Answer 1

Complex	Oxidation State
$\left[Co\right(NCS\left)\right(N{H}_3{)}_5]S{O}_3$	+3
$Na\left(Co\right(CO{)}_4]$	-1
$N{a}_4\left[Co\right(S_2{O}_3{)}_3]$	+2
$Co(CO{)}_8$	+1