JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 29 June 2022, Shift 2, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

The cell potential for the given cell at 298 K

\mathrm{Pt|H_2\,(g,1\ bar)|H^{+}\,(aq)||Cu^{2+}\,(aq)|Cu(s)}

is 0.31V. The pH of the acidic solution is found to be 3, whereas the concentration of

\mathrm{Cu^{2+}}

10^{-x}

M. The value of

x

is ___. (Given:

E^{\ominus}_{\mathrm{Cu^{2+}/Cu}}

= 0.34 V and

\frac{2.303\,RT}{F}

= 0.06 V )

Official answer

NTA final key.

Chapter: Electrochemistry
Topic: Nernst Equation
Idea tested: pH Dependence of Electrode Potential

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.