JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
\(E _{ Cu ^{2+} \mid Cu }^{\circ}=+0.34 V\) \(E _{ Zn ^{2}+\mid Zn }^{ o }=-0.76 V\) Identify the incorrect statement from the options below for the above cell
- A If \(E _{ ext }>1.1\, V , Zn\) dissolves at \(Zn\) electrode and \(Cu\) deposits at \(Cu\) electrode
- B If \(E _{\text {ext }}>1.1\, V , e ^{-}\) flows from \(Cu\) to \(Zn\)
- C If \(E _{ ext }=1.1 \,V ,\) no flow of e \(^{-}\) or current occurs
- D If \(E _{\text {ext }}<1.1\, V , Zn\) dissolves at anode and \(Cu\) deposits at cathode
Answer & Solution
Correct Answer
(A) If \(E _{ ext }>1.1\, V , Zn\) dissolves at \(Zn\) electrode and \(Cu\) deposits at \(Cu\) electrode
Step-by-step Solution
Detailed explanation
\(E _{\text {cell }}^{\circ}=0.34-(-0.76)\) \(\quad=1.10\) volt If \(E _{\text {ext }}>1.10\) volt \(Cu \rightarrow\) Anode \(Zn \rightarrow\) Cathode If \(E _{\text {ext }}=1.10\, volt\) \(Zn \rightarrow\) Anode \(Cu \rightarrow\) Cathode
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