JEE Main 2021ChemistryIonic EquilibriumHardMCQ

JEE Main 2021 — Ionic Equilibrium Question with Solution

JEE Main 2021 (20 Jul Shift 2)

Question

A solution is 0.1M in Cl- and 0.001M in CrO42-.
Solid AgNO3 is gradually added to it Assuming that the addition does not change in volume and Ksp(AgCl)=1.7×10-10M2 and
KspAg2CrO4=1.9×10-12M3.

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Show full solutionCorrect option: D
Correct answer
DAgCl will precipitate first as the amount of Ag+ needed to precipitate is low.

Step-by-step explanation

i Ag+ required to ppt AgCls

Ksp=IP=Ag+Cl-=1.7×10-10

Ag+=1.7×10-9

ii Ag+ required to ppt Ag2CrO4s

Ksp=IP=[Ag+]2CrO4-2=1.9×10-12

Ag+=4.3×10-5

Ag+ required to ppt AgCl is low so AgCl will ppt 1st.

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About this question

This is a previous-year question from JEE Main 2021, covering the Ionic Equilibrium 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.