Latimer-type combination of half reactions (Delta G additivity)

8 questions on Latimer-type combination of half reactions (Delta G additivity) from the Electrochemistry chapter: 1 NEET level, 3 JEE Main, 4 JEE Advanced. Each one opens with its answer and solution.

• Given E deg(Fe^3+/Fe^2+) = 0.77 V and E deg(Fe^2+/Fe) = -0.44 V. The standard potential of Fe^3+ + 3e- -> Fe is NEET level
• In acidic solution, E deg(MnO4^-/MnO2) = 1.70 V (3 electrons) and E deg(MnO2/Mn^2+) = 1.23 V (2 electrons). E deg(MnO4^-/Mn^2+) is JEE Main level
• Given E deg(Tl^3+/Tl+) = 1.25 V and E deg(Tl+/Tl) = -0.34 V. The standard reduction potential (in V, two decimals) of Tl^3+ + 3e- -> Tl is. JEE Main level
• E deg(Au^3+/Au) = 1.50 V and E deg(Au+/Au) = 1.68 V. The standard potential of the couple Au^3+/Au+ (Au^3+ + 2e- -> Au+) is JEE Main level
• For mercury, E deg(Hg2^2+/Hg) = 0.80 V for Hg2^2+ + 2e- -> 2Hg and E deg(Hg^2+/Hg2^2+) = 0.92 V for 2Hg^2+ + 2e- -> Hg2^2+. The standard Gibbs energy change (in... JEE Advanced level
• For indium, E deg(In^3+/In+) = -0.44 V and E deg(In+/In) = -0.14 V at 298 K. Taking (2.303RT)/(F) = 0.0591 V, which statement about In+ in aqueous solution is c... JEE Advanced level
• Standard potentials for chlorine species in 1 M acid (V): ClO3^-/HClO2 = 1.21, HClO2/HOCl = 1.65, HOCl/Cl2 = 1.61, Cl2/Cl- = 1.36. Which statements are correct? JEE Advanced level
• For chromium, E deg(Cr^3+/Cr) = -0.74 V and E deg(Cr^3+/Cr^2+) = -0.42 V. The standard potential of Cr^2+/Cr and the stability of Cr^2+ towards disproportionati... JEE Advanced level