JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 31 August 2021, Shift 2, Chemistry Q60

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

The transformation occurring in Duma’s method is given below

\mathrm{C_2H_7N} + \left(2x + \frac{y}{2}\right)\mathrm{CuO} \rightarrow x\ \mathrm{CO_2} + \frac{y}{2}\mathrm{H_2O} + \frac{z}{2}\mathrm{N_2} + \left(2x + \frac{y}{2}\right)\mathrm{Cu}

The value of

y

is __________. (Integer answer)

Official answer

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 10× in all

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
3 Apr 2025, Shift 1 · Q75During estimation of nitrogen by Dumas' method of compound X (0.42 g) [structure X: piperazine, six-membered ring with two NH groups at…EasyNumerical valueHas a figure
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
7 Apr 2025, Shift 2 · Q74In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas ( $\mathrm{N_2}$ ) at 300 K temperature and 715 mm Hg…MediumNumerical value
28 Jul 2022, Shift 2 · Q56A sample of 0.125g of an organic compound when analyzed by Duma's method yields 22.78 mL of nitrogen gas collected over KOH solution at…MediumNumerical value
24 Jun 2022, Shift 2 · Q880.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of N $_2$ evolved (at STP) was found…EasyNumerical value
27 Aug 2021, Shift 1 · Q60The number of moles of CuO, that will be utilized in Dumas method for estimating nitrogen in a sample of 57.5 g of…HardNumerical value
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

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.