In an electrochemical series, standard electrode potentials are arranged on the basis of:
Correct answer: C. Hydrogen Scale
- A. pH scale
- B. pOH scale
- C. Hydrogen Scale
- D. pKa scale
Explanation
A is incorrect as pH scale is a tool to measure pH(acidity) of a B is incorrect as pOH scale is a tool to measure pOH(alkalinity) of a solution.C is correct as in an electrochemical cell set-up, standard electrode potentials are set up on the basis of hydrogen potential.D is incorrect as pKa is -log of Ka of a solution
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About Standard Hydrogen Electrode
The standard hydrogen electrode provides the reference potential of 0.00 V for measuring electrode potentials. It consists of platinum in contact with hydrogen gas at standard pressure and hydrogen ions at standard concentration, usually at 25°C, and can operate as either the oxidation or reduction half-cell.
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