(B) Let the oxidation state of $Co$ be $x$.In the complex $[Co(H_2O)_5Cl]^{2+}$,the oxidation state of $H_2O$ is $0$ and $Cl$ is $-1$.The sum of oxida

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(B) Let the oxidation state of $Co$ be $x$.In the complex $[Co(H_2O)_5Cl]^{2+}$,the oxidation state of $H_2O$ is $0$ and $Cl$ is $-1$.The sum of oxidation states equals the charge on the complex:$x + 5(0) + (-1) = +2$$x - 1 = +2$$x = +3$Therefore,the oxidation state of $Co$ is $+3$.