JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 2 April 2025, Shift 1, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

On 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 formula mass of compound (X) is ___________g. (Given molar mass in

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

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

(1)15
(2)30Official answer
(3)45
(4)60

Official answer

Option 2

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 8× in all

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
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
8 Apr 2023, Shift 1 · Q900.5 g of an organic compound (X) with 60% carbon will produce ______ $\times10^{-1}$ g of $\mathrm{CO_2}$ on complete combustion.EasyNumerical value
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.