Question

The electrode potential of standard hydrogen electrode is assigned a value of __________.
A) $0\,\,volt$
B) $1\,\,volt$
C) $100\,\,volt$
D) $10\,\,volt$

Answer 1

To solve this question, we must first understand the concept of electrode potential and standard hydrogen electrode. Then we need to assess the key points about the value of standard electrode potential and then only we can conclude the correct answer.

Complete solution:
Before we move forward with the solution of this given question, let us first understand some basic concepts:
Standard electrode potential: is a measurement of the potential for equilibrium. There is a potential difference between the electrode and the electrolyte called the potential of the electrode. When the concentrations of all the species involved in a semi-cell is equal to unity then, the electrode potential is known as the standard electrode potential.
Standard Hydrogen Electrode is used as a reference electrode when calculating the standard electrode potential of a half cell.
Standard Hydrogen Electrode represented by SHE, and its standard electrode potential is declared to be $0\,\,volt$ at a temperature of $298K$ . This is because it acts as a reference for comparison with any other electrode.
The redox half-cell of the SHE is where the following reaction takes place:
$2{H^ + }(aq)\,\, + \,\,2{e^ - }\,\, \to \,{H_2}(g)$
So, clearly from the above statements we can conclude that the electrode potential of standard hydrogen electrode is assigned a value of $0\,\,volt$ .

Therefore, the correct answer is (B).

Note: SHE is the basic guide for the reporting of the capacity of quantitative half-cells. It is a type of gas electrode and has been commonly used as a reference electrode and as an indicator electrode for calculating pH values in early studies.