CGPET 2018 Solved Paper

For the reaction,
2Ag+2H+ ────▸H2+2Ag+
Standard free energy change (ΔG°)=−nFE°
where, n= number of electrons change.
F= charge over one mole of electrons i.e. 96500C.
E°= standard electrode potential
∵ In the reaction, Ag ───▸Ag+ i.e. oxidation of silver takes place and n=2
∴ ΔG°=−2×96500×[(−)0.8]
=154400J∕mol=154.4kJ∕mol
∴ Hence, (b) is the correct option.