Question

The primary and secondary valencies of chromium in the complex ion, $dichlorodioxalatochromium \,(III)$, are respectively

• A. 44624
• B. 44654
• C. 3,6
• D. 44715

Answer 1

Answer: (C)

3,6

Answer 2

The formula of dichlorodioxalatochromium (III) is
${{[Cr(C{{l}_{2}}){{(Ox)}_{2}}]}^{3-}}$
Primary valency of a metal $(Cr)$ in the complex = oxidation number of that metal
$=+3$
Secondary valency of chromium in complex = coordination number
$=+6$
( $\because$ Coordination number is the number of ligands attached to the central metal ion and oxalate ion is a bidentate ligand i.e, can coordinate at two positions)