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Question

Consider the following reaction :  2Ag++C6H12O6+H2O2Ag(s)+C6H12O7+2H+ When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much ?
Ag++eAg;   Eored=0.8 VC6H12O6+H2OC6H12O7+2H++2e;Eored=0.05 VAg(NH3)+2+eAg(s)+NH3;Eored=0.337 V
  1. Eoxid Will increase by a factor 0.65 from Eooxid
  2. Ered will increase by a factor of  0.65 from  Eored
  3. Ered Will decrease by a factor of 0.65 from
  4. Eoxid Will decrease by a factor of 0.65 from Eooxid


Solution

The correct option is A Eoxid Will increase by a factor 0.65 from Eooxid
As ammonia is — added the concentration of H+ decreases, thus oxidation potential increases by 0.65.

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