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Consider the reaction, 2 Ag ⁺+ Cd 2 Ag + Cd ²⁺ The standard electrode potentials for Ag ⁺ Ag and Cd ²⁺ Cd couples are 0.80 volt and 0.40 volt respectively. (i) What is the standard potential E ^0 for this reaction? (ii) For the electrochemical cell, in which this reaction takes place which electrode is negative electrode? (mark the answer in volt)

Correct answer

1.20

Step-by-step solution

(i) The half reactions are: gathered at cathode 2 Ag ⁺( aq )+2 e ⁻ 2 Ag ( ~s ) gathered aligned & E _ Ag / Ag ^ =0.80 volt (Reduction potential) & array l atanode Cd ( s ) array Cd ²⁺( aq )+2 e ⁻ aligned aligned & E _ Cd ⁺ / Cd ^ =-0.40 volt (Reduction potential) & or E_ Cd ₁ / d ²⁺ ^ =+0.40 volt & E^ =E_ Cd / C d⁺ ^ ^ +E_ Ag ⁺ / Ag ^ =0.40+0.80=1.20 volt aligned (ii) The negative electrode is always the electrode whose reduction potential has smaller value or the electrode where oxidation occurs. Thus, Cd electrod

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