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What is the oxidation number of the transition metal in the complex ion [Co(H$_2$O)$_5$Cl]$^{+}$?

$(a)\;+3\qquad(b)\;+4\qquad(c)\;+7\qquad(d)\;+2$

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Answer: +2
The complex ion has an overall positive charge of +1.
It has 5 neutral H$_2$O ligands with no charge and one Cl ion with a -1 charge.
Therefore the oxidation state for Co is $= +1 - (-1) = +2$
answered Jan 29, 2014 by sreemathi.v
edited Aug 4, 2014 by balaji.thirumalai
 

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