The difference in oxidation state of chromium in chromate and dichromate salts is_____. — d and f Block Elements Chemistry Question

💡 Solution & Explanation

**Step 1: Identify the chromium oxidation state in chromate ion (CrO₄²⁻)** Using the oxidation state rules where oxygen = -2 and the ion charge = -2: - Let oxidation state of Cr = x - x + 4(-2) = -2 - x - 8 = -2 - x = +6 **Step 2: Identify the chromium oxidation state in dichromate ion (Cr₂O₇²⁻)** Using oxidation state rules where oxygen = -2 and the ion charge = -2: - Let oxidation state of each Cr = x - 2(x) + 7(-2) = -2 - 2x - 14 = -2 - 2x = 12 - x = +6 **Step 3: Calculate the difference** Difference = Oxidation state in dichromate - Oxidation state in chromate Difference = (+6) - (+6) = 0 **Step 4: Interpret the result** Both chromium in chromate and dichromate exists in the +6 oxidation state. There is no change in the oxidation state of chromium between these two species. Therefore, the answer is **0.00**.