JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 June 2022, Shift 1, Chemistry Q87

Question 87 of 90 in this shift, Chemistry question 27 of 30, Section B.

In a cell, the following reactions take place

\mathrm{Fe^{2+}} \rightarrow \mathrm{Fe^{3+}} + \mathrm{e^-}

\mathrm{E^\circ_{Fe^{3+}/Fe^{2+}}} = 0.77\ \mathrm{V}

2\mathrm{I^-} \rightarrow \mathrm{I_2} + 2\mathrm{e^-}

\mathrm{E^\circ_{I_2/I^-}} = 0.54\ \mathrm{V}

The standard electrode potential for the spontaneous reaction in the cell is

x \times 10^{-2}

V 298 K. The value of

x

is __________. (Nearest Integer)

Official answer

NTA final key.

Chapter: Electrochemistry
Topic: Nernst Equation
Idea tested: Standard Cell Potential

Same idea in other shifts

Asked 13× in all

2 Apr 2026, Shift 1 · Q57An electrochemical cell is constructed using half cells in the direction of spontaneous change…MediumSingle correct
3 Apr 2025, Shift 2 · Q56The standard cell potential ( $\mathrm{E^{\ominus}_{cell}}$ ) of a fuel cell based on the oxidation of methanol in air that has been used to…MediumSingle correct
5 Apr 2024, Shift 2 · Q64For the electro chemical cell $\mathrm{M|M^{2+}||X|X^{2-}}$ If $\mathrm{E^0_{(M^{2+}/M)}} = 0.46\ \mathrm{V}$ and…MediumSingle correct
9 Apr 2024, Shift 1 · Q85The standard reduction potentials at 298 K for the following half cells are given below :…MediumNumerical value
30 Jan 2024, Shift 2 · Q65Reduction potential of ions are given below: $\mathrm{ClO_4^-}$ $E^\circ = 1.19\ V$ ; $\mathrm{IO_4^-}$ $E^\circ = 1.65\ V$ ;…EasySingle correct
6 Apr 2023, Shift 2 · Q86The standard reduction potentials at 298 K for the following half cells are given below:…MediumNumerical value
11 Apr 2023, Shift 2 · Q86The number of correct statements from the following is _______ A. $\mathrm{E_{cell}}$ is an intensive parameter B. A negative…MediumNumerical value
28 Jul 2022, Shift 1 · Q70Which of the following has least tendency to liberate $\mathrm{H_2}$ from mineral acids ?EasySingle correct

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.