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2. Electrochemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry2. Electrochemistry1 Mark
MCQ
A standard hydrogen electrode has zero electrode potential because
  • A
    Hydrogen is easiest to oxidise
  • ✓
    The electrode potential is assumed to be zero
  • C
    Hydrogen atom has only one electron
  • D
    Hydrogen is the lightest element
✓

Answer

Correct option: B.
The electrode potential is assumed to be zero
b
Potential is a relative term i.e. it is always measured with respect to a reference. In electrochemistry, hydrogen is taken to be the reference to measure the potential and hence to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential is declared to be zero volts at all temperatures.

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