The standard reduction potential of $Ag^+/Ag$ electrode is +0.80 V. Choose the correct statement based on this information.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $Ag^+/Ag$ couple is a weaker reducing agent than $H^+/H_2$ couple
The standard reduction potential of the Ag⁺/Ag couple is +0.80 V, which is greater than that of the standard hydrogen electrode (SHE = 0.00 V).
Key implications:
- Higher $E^\circ$ ⇒ greater tendency to be reduced
- Therefore, Ag⁺ is reduced more easily than H⁺
- Consequently, Ag (metal) is less easily oxidised than H₂
- Hence, Ag is a weaker reducing agent than H₂
Now check the statements:
- Ag⁺/Ag couple is a stronger reducing agent than H⁺/H₂ couple -- Incorrect
- Ag⁺/Ag couple is a weaker reducing agent than H⁺/H₂ couple --correct
- Ag can be easily oxidised as compared to H₂-- incorrect
- Ag⁺/Ag will act as anode when coupled with SHE-- incorrect