Question

The coordination number and the oxidation state of the central metal ion in the complex ion $ [CrCl_{2}(ox)_{2}]^{3-} $ are respectively,

• A. $ 4 $ and $ 3- $
• B. $ 6 $ and $ 3+ $
• C. $ 4 $ and $ 3+ $
• D. $ 6 $ and $ 3- $

Answer 1

Answer: (B)

Complex ion : $[CrCl_{2} (ox)_{2}]^{3-}$
Coordination number is $6$ as oxalato is a didentate ligand
Oxidation state of central metal ion :
$x-2-4=-3$,
$x=+3$