The number of Faradays of electricity required to reduce one mole of ions to in acidic medium is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

In $Cr_2O_7^{2-}$, each $Cr$ is +6. In the product, $Cr$ is +3. <br>For 2 $Cr$ atoms in 1 mole of $Cr_2O_7^{2-}$, the total change in O.S. = $2 \times (6 - 3) = 6$. <br>Since 1 mole of electrons = 1 Faraday, 6 Faradays are required.