JEE Main · 2021 · 26 Aug 2021 · Shift 1 · Redox Reactions and Electrochemistry

The standard reduction potential of a metal ion-metal couple is fixed by the energy cycle that takes the solid metal to its hydrated ion in solution: atomisation of the solid, which costs the sublimation enthalpy; removal of electrons from the gaseous atom, which costs the ionisation enthalpy; and solvation of the gaseous ion, which releases the hydration enthalpy. Electron gain enthalpy belongs to the formation of a gaseous anion from a gaseous atom and plays no part in this cycle. The number of the listed properties that affect the reduction potential is $3$.