The primary and secondary valencies of chromium in the complex ion,
\[
[\mathrm{CrCl_2(C_2O_4)_2}]^{3-}
\]
are respectively \(x\) and \(y\). The sum of \(x\) and \(y\) is
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For coordination compounds,
\[
\boxed{\text{Primary valency}=\text{Oxidation state}}
\]
and
\[
\boxed{\text{Secondary valency}=\text{Coordination number}.}
\]
A bidentate ligand contributes two coordination sites.