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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 2 September 2020, Shift 2, Chemistry Q26

Question 26 of 75 in this shift, Chemistry question 1 of 25.

The results given in the below table were obtained during kinetic studies of the following reaction : 2 A+B→C+D2\,\mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} + \mathrm{D} Experiment | [A]/molL−1[\mathrm{A}]/\mathrm{molL^{-1}} | [B]/molL−1[\mathrm{B}]/\mathrm{molL^{-1}} | Initial rate/molL−1 min−1\mathrm{molL^{-1}\,min^{-1}} I | 0.1 | 0.1 | 6.00×10−36.00\times10^{-3} II | 0.1 | 0.2 | 2.40×10−22.40\times10^{-2} III | 0.2 | 0.1 | 1.20×10−21.20\times10^{-2} IV | X | 0.2 | 7.20×10−27.20\times10^{-2} V | 0.3 | Y | 2.88×10−12.88\times10^{-1} X and Y in the given table are respectively :

The figure, in words

Table printed in the stem: columns Experiment, [A]/molL^-1, [B]/molL^-1, Initial rate/molL^-1 min^-1; five rows I-V (values transcribed in the stem).
  1. (1)0.4, 0.4
  2. (2)0.4, 0.3
  3. (3)0.3, 0.3
  4. (4)0.3, 0.4Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Chemical Kinetics
Topic
Rate Laws
Idea tested
Initial Rates Method

Same idea in other shifts

Asked 9× in all
  1. 5 Apr 2024, Shift 1 · Q85During Kinetic study of reaction 2A+B→C+D2\mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} + \mathrm{D}, the following results were obtained : A…MediumNumerical valueHas a figure
  2. 27 Jan 2024, Shift 1 · Q87Consider the following data for the given reaction 2 HI(g)→H2(g)+I2(g)\mathrm{2\ HI_{(g)} \rightarrow H_{2(g)} + I_{2(g)}} | 1 | 2 | 3…EasyNumerical value
  3. 11 Apr 2023, Shift 2 · Q63For a chemical reaction A + B →\to Product, the order is 1 with respect to A and B. | Rate mol L−1 S−1\mathrm{mol\ L^{-1}\ S^{-1}} | [A]…MediumSingle correctHas a figure
  4. 27 Jul 2022, Shift 1 · Q822NO+2H2→N2+2H2O\mathrm{2NO + 2H_2 \rightarrow N_2 + 2H_2O} The above reaction has been studied at 800∘800^\circC. The related data are given in the table…EasyNumerical value
  5. 29 Jul 2022, Shift 1 · Q87The reaction between X and Y is first order with respect to X and zero order with respect to Y. Experiment | [X] mol L−1\mathrm{mol\ L^{-1}} |…MediumNumerical valueHas a figure
  6. 3 Aug 2021, Shift 1 · Q57The following results have been obtained during the kinetic studies of the reaction. A + 2B ⟶ 2C Experiment | [A], mol L−1\mathrm{L^{-1}} |…EasyNumerical valueHas a figure
  7. 26 Aug 2021, Shift 1 · Q56The following data was obtained for chemical reaction given below at 975 K.…EasyNumerical value
  8. 18 Mar 2021, Shift 1 · Q572 NO(g)+Cl2(g)⇌2 NOCl(s)\mathrm{2\,NO(g) + Cl_2(g) \rightleftharpoons 2\,NOCl(s)} This reaction was studied at −10-10°C and the following data was obtained run |…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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.