H2 gas in SHE is filled at pressure of___________________?
Correct answer: A. 760mm of Hg
- A. 760mm of Hg
- B. 750mm of Hg
- C. 780mm of Hg
- D. 800mm of Hg
Explanation
The standard hydrogen electrode uses hydrogen gas at a standard pressure of 1 atmosphere, which is equal to 760 mm Hg. Students may choose 750 mm Hg by confusing it with an approximate atmospheric pressure value, but the conventional standard value used here is 760 mm Hg.
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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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Potential of Standard Hydrogen Electrode (SHE) is arbitrarily taken as: