When `K_2 Cr_2 O_7` is converted to `K_2 CrO_4` then change in the oxidation state of chromium is :

When K_(2)Cr_(2)O_(7) is converted to K_(2)CrO_(4) , the change in the oxidation state of chromium is

The oxidation state of Cr in CrO_5 is

K_(2)Cr_(2)O_(7)+SO_(2) overset(H+)to products the oxidation state of chromium changes from

What are the oxidation states of chromium in the following : CrO_(4)^-2

The oxidation state of Cr in Cr_(2)O_(7)^(2-) is

When K_2 Cr_2 O_7 crystals are heated with conc. HCl, the gas evolved is

K_(2)Cr_(2)O_(7) react with hydrazins to form product. The oxidation state of Cr in the product will be :-

When C_2O_5OH is heated with acidified K_2Cr_2O_7 it forms

In the conversion of K_(2)Cr_(2)O_(7) to K_(2)CrO_(4) the oxidation number of the following changes

4K_(2) Cr_(2) O_(7) overset(heat)rarr 4K_(2) CrO_(4) + 3O_(2) + X . In the above reaction X is