GATE MT 2022 Q33.
The emf of the cell
Au-Pb(liquid) PbCl2-KCl(liquid) Cl2(gas, 0.5 atm), C(graphite)
is 1.2327 V at 873 K. Activity of Pb in the Au-Pb alloy is 0.72 and the activity of PbCl2 in the electrolyte is 0.18. The standard Gibbs energy of formation of PbCl2(liquid) at 873 K is kJmol1 (round off to 1 decimal place). Given: R = 8.314 JK1mol1 and F = 96500 Cmol1.