Chemistry - Electrochemistry Question with Solution | TestHub

P: Same electrode (Zn/Zn²⁺) with different concentrations → concentration cell

→ Cell is spontaneous , EMF ≠ 0 , at equilibrium EMF = 0

Matches 1, 3, 4

Q: Pt | H₂ | HCl || HCl | Cl₂ | Pt

→ Proper redox cell, spontaneous reaction possible and standard EMF ≠ 0

Matches 1

R: Cu/Cu²⁺ and Ag⁺/Ag

→ Ag⁺ reduced, Cu oxidized → spontaneous

→ Ag⁺ (cation at cathode) decreases

Matches 1, 3

S: Ag/AgCl electrode system

→ Involves Cl⁻ participation

→ Cl⁻ concentration in anode decreases and process spontaneous

Matches 1, 3, 5