Effect of pH on redox couples

9 questions on Effect of pH on redox couples from the Electrochemistry chapter: 2 NEET level, 2 JEE Main, 5 JEE Advanced. Each one opens with its answer and solution.

• For the couple MnO4- + 8H+ + 5e- -> Mn^2+ + 4H2O at 298 K, with [MnO4-] and [Mn^2+] kept constant, the reduction potential changes per unit increase in pH by (t... NEET level
• The reduction potential of which of the following couples is independent of pH? NEET level
• For Cr2O7^2- + 14H+ + 6e- -> 2Cr^3+ + 7H2O at 298 K, a plot of reduction potential against pH (other concentrations fixed) is a straight line of slope (take 2.3... JEE Main level
• E deg(O2, H+/H2O) = 1.23 V for O2 + 4H+ + 4e- -> 2H2O. The reduction potential of this couple at pH 7 and p_O2 = 1 bar at 298 K is (take 2.303RT/F = 0.0591 V) JEE Main level
• Take 2.303RT/F = 0.0591 V at 298 K. Which of the following statements are correct? JEE Advanced level
• E deg(MnO4-, H+/Mn^2+) = 1.51 V and E deg(Br2/Br-) = 1.07 V at 298 K. With [MnO4-] = [Mn^2+] = [Br-] = 1 M and Br2 as pure liquid, the pH above which permangana... JEE Advanced level
• E deg(Cr2O7^2-, H+/Cr^3+) = 1.33 V. The reduction potential of the dichromate couple at 298 K in a solution with [Cr2O7^2-] = 0.01 M, [Cr^3+] = 0.01 M and pH 2 ... JEE Advanced level
• E deg(MnO4-, H+/Mn^2+) = 1.51 V (n = 5, 8 H+) and E deg(Cr2O7^2-, H+/Cr^3+) = 1.33 V (n = 6, 14 H+). All other species are at unit concentration and 2.303RT/F =... JEE Advanced level
• E deg for H3AsO4 + 2H+ + 2e- -> H3AsO3 + H2O is 0.56 V and E deg(I2/I-) = 0.54 V at 298 K. All dissolved species are at 1 M except H+, and 2.303RT/F = 0.0591 V.... JEE Advanced level