JEE Main 2025 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 3 April 2025, Shift 1, Chemistry Q74

Question 74 of 75 in this shift, Chemistry question 24 of 25, Section B.

0.5 g of an organic compound on combustion gave 1.46 g of

\mathrm{CO_2}

and 0.9 g of

\mathrm{H_2O}

. The percentage of carbon in the compound is ______. (Nearest integer) [Given : Molar mass (in

\mathrm{g\,mol^{-1}}

) C : 12, H : 1, O : 16]

Official answer

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: Stoichiometry
Idea tested: Empirical Formula from Combustion Data

Same idea in other shifts

Asked 4× in all

2 Apr 2025, Shift 1 · Q63On complete combustion 1.0 g of an organic compound (X) gave 1.46 g of $\mathrm{CO_2}$ and 0.567 g of $\mathrm{H_2O}$ . The empirical…MediumSingle correct
8 Apr 2025, Shift 2 · Q62On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g $\mathrm{H_2O}$ and 0.307 g $\mathrm{CO_2}$ . The…MediumSingle correct
28 Jul 2022, Shift 1 · Q90On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of $\mathrm{CO_2}$ and 0.4428 g of…EasyNumerical 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 42 of the 174 JEE Main shifts held from 2017 to 2026.