Question

Platinum electrode surrounded by an outer tube, in which hydrogen passes entering through side inlet and escaping at the bottom through the test solution, is called as:

• A. Silver electrode
• B. Calomel electrode
• C. Standard hydrogen electrode
• D. Indicator electrode

Answer 1

The Correct Option is C

The question at hand asks about an electrode setup involving a platinum electrode, hydrogen gas, and a test solution, with hydrogen entering and escaping in a specific manner. This setup aligns perfectly with the description of a Standard Hydrogen Electrode (SHE).

Let's explore why the Standard Hydrogen Electrode is the correct choice among the given options:

1. Concept of Standard Hydrogen Electrode (SHE):
   • The SHE consists of a platinum electrode as a base, which is immersed in an acidic solution where the concentration of H₃O⁺ ions is 1 M.
   • Hydrogen gas is bubbled through the solution at a pressure of 1 atm. The platinum electrode allows for the absorption or release of H₂ gas at its surface, establishing an equilibrium between H₂ and H⁺ ions in the solution.
   • SHE is used as a reference electrode in electrochemical cells, having a standard electrode potential of 0.00 V by definition.
2. Comparison with Other Options:
   • Silver electrode: Typically used for reference or specific redox reactions involving silver but does not involve hydrogen gas or setup described.
   • Calomel electrode: A different type of reference electrode that involves mercury and a chloride ion, not hydrogen gas.
   • Indicator electrode: Generally refers to an electrode used in potentiometric analysis to indicate the endpoint of a titration, does not match description involving hydrogen gas or platinum.
3. Conclusion: Based on the setup's description and its use as a reference electrode, the configuration matches the Standard Hydrogen Electrode. Hence, Standard Hydrogen Electrode is the correct answer.

Therefore, the correct answer is: Standard Hydrogen Electrode.