The oxidation states of Cr in [ Cr ( H _ 2 O ) _ 6 ]C l _ 3 , [ Cr(...

$[ Cr\left({H}_{2}O{)}_{6}\right]C{l}_{3}: x + 6 \times 0 + 3 \times - 1 = 0$

$x = + 3$

$[ Cr$\left({C}_{6}{H}_{6}{)}_{2}\right]: x + 2 \times 0$<br/><br/>$x = 0$<br/><br/>${K}_{2} [ Cr \left(CN{)}_{2}{ \left(O\right)}_{2}\left({O}_{2}\right)\left(N{H}_{3}\right)\right]$<br/><br/>$2 \times ( +1 ) + x + 2 \times ( -1 ) + 2 \times ( -2 ) + 2 \times ( -1 ) + 0 = 0$<br/><br/>$2 + x - 2 - 4 - 2 = 0$<br/><br/>$x = + 6