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In the cell, Pt s H 2 g , 1 bar HCl aq AgCl s Ag s Pt s , the cell potential is 0 .92 V when a 10 - 6 molar HCl solution is used. The standard electrode potential of Ag | AgCl | Cl - electrode is: (Given, 2 .303 RT F = 0 .06 V at 298 K )

Options

  1. A0 .76   V
  2. B0 .20   V
  3. C0 .40   V
  4. D0 .94   V

Correct answer

B. 0 .20   V

Step-by-step solution

A : 1 2 H 2 g → H +   aq . + e - ;   E o = 0 .0   V C   : AgCl   s + e - → Ag   s + Cl - ;   E o = xV E cell = E cell o - 0 .06 1 log ⁡ H + Cl - 0 .92 = x - 0 . 06 1 log ⁡ 10 - 12 0 .92 = x + 0 . 72 x = 0 .92 - 0 .72 = 0 . 2 V

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