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Q. What is the oxidation state of $Co$ in $ [Co(H_{2}O)_{5}Cl]^{2+}? $

AMUAMU 2013Coordination Compounds

Solution:

Oxidation state of $Co$ in $ [Co(H_{2}O)_{5}Cl]^{2+} $ is $+3$.
$ x+(5\times 0)+(-1)=+2 $
$ x=+3 $