MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Potassium dichromate (K_2Cr_2O_7) acts as a strong oxidizing agent in an acidic medium. It oxidizes iodide ions (I^-) from KI to iodine (I_2) and itself gets reduced to chromium(III) ions (Cr^ 3+ ). The ionic equation for the reaction is: Cr_2O_7^ 2- + 14H^+ + 6I^- 2Cr^ 3+ + 3I_2 + 7H_2O In the final product, chromium is present as Cr^ 3+ . Therefore, the oxidation state of chromium in the final product is +3. Answer: +3