NEET 2022 Chemistry Standard Electrode Potentials MCQ Question
At 298 K, the standard electrode potentials of Cu²⁺/Cu, Zn²⁺/Zn, Fe²⁺/Fe and Ag⁺/Ag are 0.34 V, -0.76 V, -0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction CANNOT occur?
FeSO₄(aq) + Zn(s) → ZnSO₄(aq) + Fe(s)
2CuSO₄(aq) + 2Ag(s) → 2Cu(s) + Ag₂SO₄(aq)
CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s)
CuSO₄(aq) + Fe(s) → FeSO₄(aq) + Cu(s)
Correct Answer
Detailed Explanation
The reaction in option B cannot occur because silver (Ag) has a higher reduction potential than copper (Cu), meaning Ag cannot displace Cu from its salt.
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