JEE Main 2015ChemistryElectrochemistryMediumMCQ

JEE Main 2015 — Electrochemistry Question with Solution

JEE Main 2015 (10 Apr Online)

Question

A variable, the opposite external potential (Eext) is applied to the cell Zn | Zn2+ 1M∥Cu2+ 1 M| Cu, of potential 1.1 V. When Eext<1.1 V and Eext>1.1 V, respectively electrons flow from

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Show full solutionCorrect option: B
Correct answer
Banode to cathode and cathode to anode.

Step-by-step explanation

For a Daniel cell,

Ecell=0.34-(-0.76)=1.10 V.

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

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

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About this question

This is a previous-year question from JEE Main 2015, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.