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Saturday, 31 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 29 June 2022, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

The activation energy of one of the reactions in a biochemical process is 532611 J mol−1532611\ \mathrm{J\ mol^{-1}}. When the temperature falls from 310 K to 300 K, the change in rate constant observed is k300=x×10−3 k310k_{300} = x \times 10^{-3}\ k_{310}. The value of xx is ____________. [Given : ln⁡10=2.3\ln 10 = 2.3 R=8.3 J K−1 mol−1R = 8.3\ \mathrm{J\ K^{-1}\ mol^{-1}}]

Official answer

1

NTA final key (2022 Session 1).

Chapter
Chemical Kinetics
Topic
Arrhenius Equation
Idea tested
Two-Point Arrhenius Equation

Same idea in other shifts

Asked 7× in all
  1. 2 Apr 2026, Shift 1 · Q74For reaction A→P\mathrm{A\rightarrow P}, rate constant k=1.5×103 s−1k=1.5\times10^3\ \mathrm{s^{-1}} at 27∘27^\circC If activation energy for the above…MediumNumerical value
  2. 8 Apr 2026, Shift 2 · Q57Given below are two statements : R=8.314 J K−1 mol−1R = 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
  3. 27 Aug 2021, Shift 2 · Q59The first order rate constant for the decomposition of CaCO3\mathrm{CaCO_3} at 700 K is 6.36×10−36.36 \times 10^{-3} s−1\mathrm{s^{-1}} and…MediumNumerical value
  4. 25 Feb 2021, Shift 2 · Q57The rate constant of a reaction increases by five times on increase in temperature from 27∘^\circC to 52∘^\circC. The value of…MediumNumerical value
  5. 9 Jan 2020, Shift 2 · Q48A sample of milk splits after 60 min. at 300 K and after 40 min. at 400 K when the population of lactobacillus acidophilus in it doubles.…MediumNumerical value
  6. 6 Sep 2020, Shift 2 · Q48The rate of a reaction decreased by 3.555 times when the temperature was changed from 40 °C to 30 °C. The activation energy (in kJ…MediumNumerical value

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.