Chemistry - Electrochemistry Question with Solution | TestHub

$E_{cell}^{\circ }=1.36-(-0.76)=2.12V$.

$E_{cell}^{\circ }>0⟹$ reaction spontaneous and $E_{cell}>2V$. Match: 1, 3

Both electrodes are H₂ electrodes with different H⁺ concentrations (pH 2 & pH 3).

This forms a concentration cell with small EMF ($<2V$). Match: 2, 4

Zn | Zn²⁺ || Cu²⁺ | Cu $⟹E_{cell}^{\circ }=1.10V$.

$E_{cell}^{\circ }$ positive $⟹$ reaction spontaneous and $E_{cell}<2V$. Match: 1, 4

Ag/AgI electrode with hydrogen electrode gives small EMF ($<2V$).

Reaction in given direction is non-spontaneous.