Question

Using the data given below find out the strongest reducing agent.

$Eº_{CrO_{7}^{2 -}/Cr^{3 +}} = 1.33V;Eº_{Cl_{2}/Cl} = 1.36V$

$Eº_{MnO_{4}^{-}/Mn^{2 +}} = 1.51V;Eº_{Cr^{3 +}/Cr} = - 0.74V$

• A. $Cl^{-}$
• B. Cr
• C. $Cr^{3 +}$
• D. $Mn^{2 +}$

Answer 1

Answer: (B)

Cr

Answer 2

Lower the value of reduction potential stronger is the reducing agent i.e., undergoes oxidation most easily.

$Cr \rightarrow Cr^{3 +} + 3e^{-}$ (oxidation)

Hence, Cr is the strongest reducing agent.