JEE Main 2024 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 31 January 2024, Shift 2, Chemistry Q83

Question 83 of 90 in this shift, Chemistry question 23 of 30, Section B.

The molarity of 1 L orthophosphoric acid (

\mathrm{H_3PO_4}

) having 70% purity by weight (specific gravity 1.54 g cm

^{-3}

) is _________ M. (Molar mass of

\mathrm{H_3PO_4}

= 98 g mol

^{-1}

)

Official answer

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Mole Concept
Idea tested: Specific Gravity in Concentration

Same topic in other shifts

All Mole Concept questions

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4 Apr 2026, Shift 2 · Q51The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is:EasySingle correct
5 Apr 2026, Shift 1 · Q54What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and…EasySingle correct
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 $^{-1}$ respectively.)EasySingle correct
6 Apr 2026, Shift 2 · Q51Which of the following contain the same number of atoms ? (Given : Molar mass in g mol $^{-1}$ of H, He, O and S are 1, 4, 16 and 32…EasyOther

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.