Which of the following statements about electrode potentials is INCORRECT?
A{'text': 'A more positive standard reduction potential means a stronger oxidising species', 'label': 'A'}
B{'text': 'Reduction potentials depend on the identity of the counter-ion in the salt', 'label': 'B'}
C{'text': 'A more negative reduction potential means a stronger reducing species', 'label': 'C'}
D{'text': 'E°(H⁺/H₂) is defined as zero by convention', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Reduction potentials depend on the identity of the counter-ion in the salt', 'label': 'B'}
1. Standard reduction potentials are intrinsic to the half-reaction and its species.
2. E° for the standard hydrogen electrode (SHE) is defined as 0 V by convention.
3. More positive E°_red → the species is a stronger oxidising agent.
4. E° does not depend on the identity of a non-electroactive counter-ion in the salt.
_Source: NCERT Class 12 Chemistry, Unit 3 "Electrochemistry", §3.2_
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