Exams › JEE Advanced › Chemistry
Consider the electrode Ag+/Ag. Identify the correct statement(s) from the following.
- (A) The reduction potential of the Ag+/Ag electrode is given by E_RP = E°_RP + (0.059/1) * log[Ag+]
- (B) When CN- ions are added to the Ag+/Ag electrode, the reduction potential E_RP decreases
- (C) Addition of CN- ions to the Ag+/Ag electrode causes an increase in the oxidation potential E°_OP
- (D) Addition of CN- ions decreases E°_OP and increases E°_RP of the Ag+/Ag electrode
Correct answer: (A) The reduction potential of the Ag+/Ag electrode is given by E_RP = E°_RP + (0.059/1) * log[Ag+]
Solution
The Nernst equation correctly gives E_RP = E°_RP + (0.059/1)*log[Ag+], so (A) is correct. CN- forms [Ag(CN)2]- complex, greatly reducing [Ag+], which lowers E_RP — confirming (B). E_OP = -E_RP, so lowering [Ag+] raises E_OP, confirming (C). Statement (D) contradicts this logic and is incorrect.
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