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

The Correct Option is A

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.