MHT CET · Chemistry · Electrochemistry
Oxidation potential of unimoles of calomel is
- A \(+0.25 \mathrm{~V}\)
- B \(0.00 \mathrm{~V}\)
- C \(+0.287 \mathrm{~V}\)
- D \(-0.28 \mathrm{~V}\)
Answer & Solution
Correct Answer
(D) \(-0.28 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Calomel is used as a secondary reference electrode. Since \(\mathrm{Hg}\) is less reactive than \(\mathrm{H}\), its standard reduction potential is positive. Hence, its standard oxidation potential must be negative, \(i e,-0.28 \mathrm{~V}\). [As standard reduction potential = \(-\) standard oxidation potential.]
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