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Friday, 9 October

JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 4 April 2026, Shift 1, Chemistry Q73

Question 73 of 75 in this shift, Chemistry question 23 of 25, Section B.

2.02.0 g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave 3.363.36 g of AgBr. The percentage of carbon in the compound (X) is 26.7%26.7\%. Total number of carbon atoms in the empirical formula for compound (X) is ______. (Given molar mass in g mol−1\mathrm{g\ mol^{-1}} H:1, C:12, Br : 80, Ag : 108)

Official answer

5

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Mole Concept
Idea tested
Empirical Formula from Mass Percentage

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2026, Shift 1 · Q51An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol−1^{-1} respectively.)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 42 of the 174 JEE Main shifts held from 2017 to 2026.