" Sum of oxidation state and coordination number for chromium in the complex "[Cr(C_(6)H_(6))_(2)]" is "

The oxidation number and co-ordination number of chromium in complex ion [Cr(C_(2)O_(4))_(2)(H_(2)O)_(2)]^(-) are

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

The oxidation state of Chromium in the complex, [Cr(NH_3)_4Cl_2]Cl is

The sum of coordination number and oxidation number of the metal M in the complex [M(en)_(2)(C_(2)O_(4))]Cl is -

What is the oxidation number of chromium in K_2Cr_2O_7 ?

The oxidation number of Cr is +6 in :

The oxidation number of Cr is +6 in :

The oxidation of Cr in the complex [Cr(H_(2)O)_(4)Cl_(2)]^(+) is