Final answer:
The oxidation state of chromium in potassium dichromate is +6, and it is also commonly found in the +3 oxidation state in chromate compounds.
Step-by-step explanation:
The oxidation state of chromium in potassium dichromate (Cr2O7^2- ) is +6. Potassium dichromate is a strong oxidizing agent that is commonly used in laboratories. Chromium can also exist in the +3 oxidation state in chromate (CrO4^2-) compounds.