JEE Main 2019ChemistrySome Basic Concepts of ChemistryMediumMCQ

JEE Main 2019 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2019 (09 Apr Shift 2)

Question

What would be the molality of 20% (mass/mass) aqueous solution of KI ? (molar mass of KI=166 g mol-1 )

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Show full solutionCorrect option: B
Correct answer
B1.51

Step-by-step explanation

Molality =Moles of soluteweight of solventg×1000
100 gm of solution contains 20 gm KI
So, the moles of KI =20166
Weight of solvent =100-20=80 gm
Molality =20×1000166×80
=1.51 Molal

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About this question

This is a previous-year question from JEE Main 2019, 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.