What is the oxidation state of \( \mathrm{Co} \) in \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \ma...
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What is the oxidation state of \( \mathrm{Co} \) in \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right]^{2+} ? \)
(A) \( +2 \)
(B) \( +3 \)
(C) \( +1 \)
(D) \( +4 \)
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