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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 17 March 2021, Shift 1, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

[reaction drawn: see figure_note] In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is __________%. (Round off to the Nearest Integer). (Given atomic mass : C : 12.0 u, H : 1.0 u, O : 16.0 u, N : 14.0 u)

The figure, in words

Benzene ring, arrow with HNO3 above and H2SO4 below, product benzene ring bearing NO2.

Official answer

80

NTA final key.

Chapter
Some Basic Concepts of Chemistry
Topic
Stoichiometry
Idea tested
Theoretical and Percent Yield

Same idea in other shifts

Asked 7× in all
  1. 27 Jul 2022, Shift 2 · Q90In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is __________…EasyNumerical valueHas a figure
  2. 29 Jul 2022, Shift 1 · Q89In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2-tetrabromopropane…MediumNumerical value
  3. 24 Feb 2021, Shift 2 · Q601.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained…EasyNumerical value
  4. 22 Jul 2021, Shift 2 · Q60Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene ________. (Nearest integer)EasyNumerical value
  5. 17 Mar 2021, Shift 2 · Q60[reaction scheme] Consider the above reaction. The percentage yield of amide product is __________. (Round off to the Nearest Integer).…MediumNumerical valueHas a figure
  6. 18 Mar 2021, Shift 2 · Q59[figure: reaction scheme] Consider the above reaction where 6.1 g of Benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The…EasyNumerical valueHas 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. 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.