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The primary and secondary valencies of...

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

A

a) 3,4

B

b) 4,3

C

c) 3,6

D

d) 6,3

Text Solution

Verified by Experts

The correct Answer is:
C
The formula of dichlorodioxalatochromium (III) is `[Cr(Cl_(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 ie , can coordinate at two positions)
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