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 8× in all

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13 Apr 2023, Shift 1 · Q88An organic compound gives 0.220 g of $\mathrm{CO_2}$ and 0.126 g of $\mathrm{H_2O}$ on complete combustion. If the % of carbon is 24 then…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
26 Jun 2022, Shift 1 · Q88On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the…EasyNumerical value
25 Feb 2021, Shift 1 · Q42Complete combustion of 1.80 g of an oxygen containing compound ( $\mathrm{C_xH_yO_z}$ ) gave 2.64 g of $\mathrm{CO_2}$ and 1.08 g of…EasySingle correct

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.