JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
A variable, opposite external potential \((E_{ext})\) is applied to the cell \(Zn\,|\,Z{n^{2 + }}\,(1\,M)\,\,||\,\,C{u^{2 + }}\,(1\,M)\,|\,Cu,\) of potential \(1.1\,V.\) When \(E_{ext} < 1.1\,V\) and \(E_{ext} > 1.1\,V,\) respectively electrons flow from
- A anode to cathode in both cases
- B cathode to anode and anode to cathode
- C anode to cathode and cathode to anode
- D cathode to anode in both cases
Answer & Solution
Correct Answer
(C) anode to cathode and cathode to anode
Step-by-step Solution
Detailed explanation
\(EMF\) of galvanic cell \(= 1 .1\,volt\) If \(E_{ext} < EMF\) then electron flows steadily from anode to cathode while If \(E_{ext} > EMF\) there electron flows from cathode to anode as polarity is changed.
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