JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 8 April 2025, Shift 2, Chemistry Q62

Question 62 of 75 in this shift, Chemistry question 12 of 25, Section A.

On 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 percentages of hydrogen and oxygen in the given organic compound respectively are:

(1)7.55, 43.85
(2)53.41, 39.6
(3)6.72, 39.87
(4)6.72, 53.41Official answer

Official answer

Option 4

NTA final key.

Chapter: Some Basic Concepts of Chemistry
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
3 Apr 2025, Shift 1 · Q740.5 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…EasyNumerical value
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.