NEET · Chemistry · STD 12 - 2. Electrochemistry
At \(298\, K\), the standard electrode potentials of \(Cu ^{2+} /\) \(Cu , Zn ^{2+} / Zn , Fe ^{2+} / Fe\) 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 can not occur ?
- A \(CuSO _{4}( aq )+ Fe ( s ) \rightarrow FeSO _{4}( aq )+ Cu ( s )\)
- B \(FeSO _{4}( aq )+ Zn ( s ) \rightarrow ZnSO _{4}( aq )+ Fe ( s )\)
- C \(2 CuSO _{4}( aq )+2 Ag ( s ) \rightarrow 2 Cu ( s )+ Ag _{2} SO _{4}( aq )\)
- D \(CuSO _{4}( aq )+ Zn ( s ) \rightarrow ZnSO _{4}( aq )+ Cu ( s )\)
Answer & Solution
Correct Answer
(C) \(2 CuSO _{4}( aq )+2 Ag ( s ) \rightarrow 2 Cu ( s )+ Ag _{2} SO _{4}( aq )\)
Step-by-step Solution
Detailed explanation
SRP: \(\quad E _{ Zn ^{2+} / 2 n }^{\circ}\,<\, E _{ Fe ^{2+} / Fe }^{\circ}\,<\, E _{ Cu ^{2+} / au }^{\circ}\,<\, E _{ Ag ^{+} / Ag }^{\circ}\) Reactivity order: \(Zn \,>\, Fe\, >\, Cu\, >\, Ag\)
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