The coordination number of of Cr in `Cr_(3)O(CH_(3)COO)_(3)H_(2)O` is
4
5
6
3

The co-ordination number of Cr in [Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3) is

The coordination number and oxidation number of Cr in K_(3)[Cr(C_(2)O_(4))_(3)] are, respectively,

The coordination number and oxidation state of Cr in K_(3)[Cr(C_(2)O_(4))_(3)] an respectively

The co-ordination number of Cr in the complex ion [Cr(H_2O)_6]^(3+) is -

The sum of oxidation states of Cr in [Cr(H_(2)O)_(6)]Cl_(3),[Cr(C_(6)H_(6))_(2)] and K_(2)[Cr(CN)_(5)(NH_(3))] respectively is.

The oxidation states of Cr in [Cr(H_(2)O)_(6)]Cl_(3). [Cr(C_(6)H_(6))_(2)] and K_(2)[Cr(CN)_(2)(O)_(2)(O_(2))(NH_(3))] respectively are