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A button cell used in watches functions as following

Zn(s) + Ag2O(s) + H2O(l) \rightleftharpoons 2Ag(s) +

Zn2+(aq) + 2 OH-(aq)

If half cell potentials are

Zn2+ (aq) + 2 e- \rightarrow Zn(s); E° = -0.76V

Ag2O(s) + H2O(l) + 2e- \rightarrow 2Ag(s) + 2OH-(aq),

E° = 0.34 V

The cell potential will be:

  • Option 1)

    1.34 V

  • Option 2)

    1.10 V

  • Option 3)

    0.42 V

  • Option 4)

    0.84 V

 

Answers (1)

best_answer

E^{\circ}_{ceu} = E^{\circ}_{0.P} + E ^ {\circ}_{R.P}

=0.76+0.34

=1.10 V


Option 1)

1.34 V

This is the incorrect option

Option 2)

1.10 V

This is the correct option

Option 3)

0.42 V

This is the incorrect option

Option 4)

0.84 V

This is the incorrect option

Posted by

prateek

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