The oxidation state of `Cr` in `K_(2)Cr_(2)O_(7)` is:

The oxidation number of Cr in K_(2)Cr_(2)O_(7) is………

The oxidation number of Cr in K_(2)Cr_(2)O_(7) is

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

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

What is the change in oxidation state of Cr" in " K_(2)Cr_(2)O_(7) when it acts as an oxidising agent.

In acidic medium, H_(2)O_(2) changes Cr_(2)O_(7)^(2-) ion to CrO_(5) . The oxidation states of Cr in Cr_(2)O_(7)^(2-) and CrO_(5) are respectively :

What is the oxidation state of Cr in K_(2)Cr0_(3)