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The calomel electrode is used as a reference electrode because its potential

  • A.changes with the concentration of the test solution
  • B.is constant and reproducible
  • C.is exactly zero at all temperatures
  • D.varies linearly with the solution's pH

Answer: B

Mercury in contact with mercurous chloride and a fixed chloride concentration gives a stable known potential, so it can replace the awkward hydrogen electrode. Its value depends on the chloride concentration chosen, which is stated with it.

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