JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 4 September 2020, Shift 2, Chemistry Q48

Question 48 of 75 in this shift, Chemistry question 23 of 25.

The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27

^\circ

C to 42

^\circ

C. Its energy of activation in J/mol is __________. (Take ln 5

=1.6094

;

R = 8.314\ \mathrm{J\ mol^{-1}K^{-1}}

)

Official answer

84290.00 to 84300.00

NTA final key (Sep 2020). Any value in the range scored.

Chapter: Chemical Kinetics
Topic: Arrhenius Equation
Idea tested: Boltzmann Factor as Active Fraction

Same topic in other shifts

All Arrhenius Equation questions

2 Apr 2026, Shift 1 · Q74For reaction $\mathrm{A\rightarrow P}$ , rate constant $k=1.5\times10^3\ \mathrm{s^{-1}}$ at $27^\circ$ C If activation energy for the above…MediumNumerical value
6 Apr 2026, Shift 2 · Q75Decomposition of a hydrocarbon follows the equation $k=(5.5\times10^{11}\,\mathrm{s^{-1}})\,e^{\frac{-28000\,\mathrm{K}}{T}}$ . The…EasyNumerical value
8 Apr 2026, Shift 2 · Q57Given below are two statements : $R = 8.314\ \mathrm{J\,K^{-1}\,mol^{-1}}$ and 1 cal = 4.2 J Statement I : When Ea = 12.6 kcal/mol, the…MediumTwo statementsHas a figure
2 Apr 2025, Shift 2 · Q56Reactant A converts to product D through the given mechanism (with the net evolution of heat) : $A \rightarrow B$ slow; $\Delta H = +$ ve…MediumDiagram basedHas a figure
3 Apr 2025, Shift 2 · Q57Consider the following statements related to temperature dependence of rate constants. Identify the correct statements. A. The Arrhenius…MediumOther
4 Apr 2025, Shift 2 · Q55Consider the following plots of log of rate constant k (log k) vs $\frac{1}{T}$ for three different reactions. The correct order of…EasyDiagram basedHas a figure

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.