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JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 1, Chemistry Q51

Question 51 of 75 in this shift, Chemistry question 1 of 25, Section A.

An 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}

respectively.)

(1) $\mathrm{FeO}$
(2) $\mathrm{Fe_2O_3}$ Official answer
(3) $\mathrm{Fe_3O_4}$
(4) $\mathrm{FeO_3}$

Official answer

Option 2

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Mole Concept
Idea tested: Empirical Formula from Mass Percentage

Same idea in other shifts

Asked 2× in all

4 Apr 2026, Shift 1 · Q73 $2.0$ g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave $3.36$ g of AgBr. The percentage of carbon in the compound (X)…MediumNumerical 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.