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Friday, 9 October

JEE Main 2025 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 3 April 2025, Shift 1, Chemistry Q75

Question 75 of 75 in this shift, Chemistry question 25 of 25, Section B.

During estimation of nitrogen by Dumas' method of compound X (0.42 g) [structure X: piperazine, six-membered ring with two NH groups at opposite (1,4) positions] ______ mL of N2\mathrm{N_2} gas will be liberated at STP. (nearest integer) (Given molar mass in g mol−1\mathrm{g\,mol^{-1}} : C : 12, H : 1, N : 14)

The figure, in words

Compound X drawn as piperazine: saturated six-membered ring with two NH groups para to each other.

Official answer

109

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Stoichiometry
Idea tested
Stoichiometry of Dumas Method

Same idea in other shifts

Asked 6× in all
  1. 2 Apr 2025, Shift 2 · Q64In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715…MediumSingle correct
  2. 3 Apr 2025, Shift 2 · Q64In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm…MediumSingle correct
  3. 7 Apr 2025, Shift 2 · Q74In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas (N2\mathrm{N_2}) at 300 K temperature and 715 mm Hg…MediumNumerical value
  4. 16 Mar 2021, Shift 2 · Q60In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg…MediumNumerical value
  5. 6 Sep 2020, Shift 2 · Q32Match the following : Test / Method — Reagent (i) Lucas Test (a) C6H5SO2Cl\mathrm{C_6H_5SO_2Cl} / aq. KOH (ii) Dumas method (b) HNO3\mathrm{HNO_3}…MediumMatch the list

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 42 of the 174 JEE Main shifts held from 2017 to 2026.