JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 28 June 2022, Shift 2, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

The complete combustion of 0.492 g of an organic compound containing ‘C’, ‘H’ and ‘O’ gives 0.793g of

\mathrm{CO_2}

and 0.442 g of

\mathrm{H_2O}

. The percentage of oxygen composition in the organic compound is __________. (nearest integer)

Official answer

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: Stoichiometry
Idea tested: POAC in Combustion Analysis

Same idea in other shifts

Asked 3× in all

2 Apr 2026, Shift 2 · Q62Complete combustion of X g of an organic compound gave 0.25 g of $CO_2$ and 0.12 g of $H_2O$ . If the % of carbon is 25% and of hydrogen is…MediumSingle correct
7 Apr 2025, Shift 1 · Q74An organic compound weighing 500 mg, produced 220 mg of $\mathrm{CO_2}$ , on complete combustion. The percentage composition of carbon in…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 108 of the 174 JEE Main shifts held from 2017 to 2026.