-factor of in a reaction where it is reduced to in basic medium is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

In basic medium, $Cr^{+6}$ in $Cr_2O_7^{2-}$ can be reduced to $Cr^{+3}$ in $Cr(OH)_3$. Change per atom = 3. Since the question asks for $n$-factor of the reagent per $Cr$ atom or molecule, and basic medium reactions for dichromate usually involve conversion to chromate first, the net change to $Cr(OH)_3$ involves 3 electrons per $Cr$. [5, 6]