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2. Electrochemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry2. Electrochemistry1 Mark
MCQ
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
  • ✓
    anode to cathode and cathode to anode
  • D
    cathode to anode in both cases
✓

Answer

Correct option: C.
anode to cathode and cathode to anode
c
$EMF$ 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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