JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2026, Shift 1, Chemistry Q51

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

The mass of iron converted into

\mathrm{Fe_3O_4}

by the action of

18

g of steam is : (Given : Molar mass of H, O and Fe are

1, 16

and

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

respectively) Assume iron is present in excess :

(1) $2.1$ g
(2) $4.2$ g
(3) $21$ g
(4) $42$ gOfficial answer

Official answer

Option 4

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Stoichiometry
Idea tested: Mass-Mass Calculations

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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.