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ChemistryElectrochemistryGalvanic cells/Nernst Equation/Concentration CellsMedium2 minPYQ_2015
ChemistryMediumstatement

A variable, the opposite external potential(Eext)is applied to the cellZn | Zn2+ 1MCu2+ 1 M| Cu, of potential1.1 V. WhenEext<1.1 VandEext>1.1 V, respectively electrons flow from

Options:

Answer:
B
Solution:

For a Daniel cell,

Ecell=0.34-(-0.76)=1.10 V.

WhenEext<1.10 V, electrons flow from anode to cathode in the external circuit.

WhenEext>1.10 V, electrons flow from cathode to anode in the external circuit (reverse reaction).

Stream:JEESubject:ChemistryTopic:ElectrochemistrySubtopic:Galvanic cells/Nernst Equation/Concentration Cells
2mℹ️ Source: PYQ_2015

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