Question

One of the commonly used electrode is calomel electrode. Under which of the following categories calomel electrode comes ?

• A. Metal – Insoluble Salt – Anion electrodes
• B. Oxidation – Reduction electrodes
• C. Gas – Ion electrodes
• D. Metal ion – Metal electrodes

Answer 1

Answer: (A)

Metal – Insoluble Salt – Anion electrodes

Answer 2

Understanding the Calomel Electrode:

The calomel electrode is commonly used as a reference electrode in electrochemical measurements. It consists of mercury ($\text{Hg}$) in contact with mercurous chloride (calomel, $\text{Hg}_2\text{Cl}_2$) in a saturated potassium chloride ($\text{KCl}$) solution.

Category of the Calomel Electrode:

The calomel electrode falls under the category of "Metal – Insoluble Salt – Anion electrodes" because it involves a metal ($\text{Hg}$), an insoluble salt ($\text{Hg}_2\text{Cl}_2$), and the chloride ions ($\text{Cl}^-$) in solution.

Conclusion:

The correct answer is Option (1): Metal – Insoluble Salt – Anion electrodes.