Use the following pairs of standard reduction potentials below to answer question 21. Respectively is A. Is the Half-reaction, and B. Is E^0(volts) ; A. Cr^ 2+ +2e^- ->Cr B.-0.913 A. Fe^2+ +2e^->Fe B. -0.447 A. Cd^2+ +2e^-> Cd B.-0.4030 A.Br2+2e^-> 2Br B. +1.06
Question 21. For each of these pairs of half -reactions , write a balanced equation for the overall cell reaction and calculate the standard cell potential, E^0cell A. Half-reactions: Cd^ 2+ (aq)+2e^ -> Cd(s); Cr^ 2+ (aq)+2e^-> Cr(s) Cell reaction : E^0cell: B. Half-reactions: Fe^ 2+ (aq)+2e^ -> Fe(s); Br2 (g)+2e^- ->2Br^ - (aq) Cell reaction : E^0cell