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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 27 August 2021, Shift 1, Chemistry Q56

Question 56 of 90 in this shift, Chemistry question 26 of 30, Section B.

The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person’s blood stream is 2K2Cr2O7+8H2SO4+3C2H6O→2Cr2(SO4)3+3C2H4O2+2K2SO4+11H2O\mathrm{2K_2Cr_2O_7 + 8H_2SO_4 + 3C_2H_6O \rightarrow 2Cr_2(SO_4)_3 + 3C_2H_4O_2 + 2K_2SO_4 + 11H_2O} If the rate of appearance of Cr2(SO4)3\mathrm{Cr_2(SO_4)_3} is 2.67 mol min−1\mathrm{min^{-1}} at a particular time, the rate of disappearance of C2H6O\mathrm{C_2H_6O} at the same time is __________ mol min−1\mathrm{min^{-1}}. (Nearest integer)

Official answer

4

NTA final key.

Chapter
Chemical Kinetics
Topic
Rate Laws
Idea tested
Rate and Stoichiometry

Same idea in other shifts

Asked 7× in all
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  4. 25 Jun 2022, Shift 1 · Q88For a given chemical reaction γ1A+γ2B→γ3C+γ4D\gamma_1 \mathrm{A} + \gamma_2 \mathrm{B} \rightarrow \gamma_3 \mathrm{C} + \gamma_4 \mathrm{D}…EasyNumerical value
  5. 4 Aug 2021, Shift 1 · Q33For a gaseous reaction, A(g)→2B(g)+C(g)\mathrm{A_{(g)} \rightarrow 2B_{(g)} + C_{(g)}}, the rate of decomposition of A(g)\mathrm{A_{(g)}} may be studied…MediumSingle correct
  6. 3 Sep 2020, Shift 2 · Q29For the reaction 2A+3B+32C→3P2\mathrm{A} + 3\mathrm{B} + \frac{3}{2}\mathrm{C} \rightarrow 3\mathrm{P} , which statement is correct ?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.