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JEE Main 2024 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2024 (31 Jan Shift 2)

Question

The molarity of 1L orthophosphoric acid H3PO4 having 70% purity by weight (specific gravity 1.54g cm−3) is ______ M. (Molar mass of H3PO4=98 g mol-1)

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Show full solutionCorrect answer: 11
Correct answer
11

Step-by-step explanation

Specific gravity (density) =1.54g/cc.

Volume =1L=1000 ml

Mass of solution =1.54×1000

=1540g

% purity of H3PO4 is 70%

So weight of H3PO4=0.7×1540=1078g

Mole of H3PO4=massmolar mass=107898=11

Molarity= No. of moles of soluteVolume of solution in L

Molarity =111L=11M

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About this question

This is a previous-year question from JEE Main 2024, covering the Some Basic Concepts of Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.