For a Galvanic cell consisting zinc electrode and standard hydrogen electrode, E ^ ( Zn _ ( aq ) ⁺² Zn _ ( s ) )=0.76 ~V . Identify the reaction that takes place at positive electrode during working of cell?

Step-by-step solution

Identifying the positive electrode reaction : In a galvanic cell, the positive terminal is the cathode where reduction occurs. The standard reduction potentials are given as E^ ( Zn ²⁺ Zn ) = -0.76 , V and E^ (2 H ⁺ H ₂) = 0.00 , V . Since 0.00 , V > -0.76 , V , the hydrogen electrode has the higher potential and functions as the cathode. Reduction occurs at this electrode with the reaction: 2 H ⁺_ ( aq ) + 2e⁻ H _ 2( g ) The zinc electrode acts as the anode where oxidation takes place. Final answer : D