Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202120 JulyEvening Shift
Exam
JEE Main
Year
2021
Date
20 July
Shift
Evening Shift
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2021 · 20 July · Evening Shift · Chemistry · Ionic Equilibrium

A solution is 0 . 1M in Cl ^ - and 0 . 001M in CrO _ 4 ^ 2 - ....

A solution is 0.1M0 . 1M in Cl−{Cl}^{-} and 0.001M0 . 001M in CrO42−.{CrO}_{4}^{2 -} .
Solid AgNO3{AgNO}_{3} is gradually added to it Assuming that the addition does not change in volume and Ksp(AgCl)=1.7×10−10M2{K}_{sp} ( AgCl ) = 1 . 7 \times {10}^{- 10}{M}^{2} and
Ksp(Ag2CrO4)=1.9×10−12M3.{K}_{sp}\left({Ag}_{2}{CrO}_{4}\right) = 1 . 9 \times {10}^{- 12}{M}^{3} .

Select correct statement from the following:

Options

  1. AAgClAgCl precipitates first because its Ksp{K}_{sp} is high.
  2. BAg2CrO4{Ag}_{2}{CrO}_{4} precipitates first as its Ksp{K}_{sp} is low.
  3. CAg2CrO4{Ag}_{2}{CrO}_{4} precipitates first because the amount of Ag+{Ag}^{+} needed is low.
  4. DAgClAgCl will precipitate first as the amount of Ag+{Ag}^{+} needed to precipitate is low.

Correct answer

D. AgClAgCl will precipitate first as the amount of Ag+{Ag}^{+} needed to precipitate is low.

Step-by-step solution

(i)[Ag+]required\left(i\right)\left[{Ag}^{+}\right] required to pptAgCl \left(s\right)</p><p>Ksp=IP=[Ag+]</p><p>Ksp = IP = \left[{Ag}^{+}\right]\left[{Cl}^{-}\right] = 1 . 7 \times {10}^{- 10}</p><p>[Ag+]=1.7×10−9</p><p>\left[{Ag}^{+}\right] = 1 . 7 \times {10}^{- 9}

\left(ii\right)\left[{Ag}^{+}\right]requiredtopptrequired to ppt{Ag}_{2}{CrO}_{4}\left(s\right)

Ksp = IP = [ Ag + {]}^{2}[CrO4−2]\left[{CrO}_{4}^{- 2}\right] = 1 . 9 \times {10}^{- 12}</p><p>[Ag+]</p><p>\left[{Ag}^{+}\right] = 4 . 3 \times {10}^{- 5}</p><p>[Ag+]required</p><p>\left[{Ag}^{+}\right] required to pptAgClislowsois low soAgClwillpptwill ppt{1}^{st} .

Practice Ionic Equilibrium on Quantrex Academy →

More from Ionic Equilibrium

Given is a concentrated solution of a weak electrolyte A_xB_y of concentration 'c' and… JEE Main 2026M_3 A_2 is a sparingly soluble salt of molar mass y g mol ^ -1 and solubility x g L ^ -1… JEE Main 2026Arrange the following resultant mixtures in increasing order of their pH values A. 10 mL… JEE Main 202620 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization.… JEE Main 2026The pH of a solution obtained by mixing 5 mL of 0.1 M NH_4OH solution with 250 mL of 0.1… JEE Main 2026The first and second ionization constants of a weak dibasic acid H_2 A are 8.1 × 10^ -8… JEE Main 2026At 25°C , 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH… JEE Main 2026The solubility product constants of Ag_2CrO_4 and AgBr are 32x and 4y respectively at 298… JEE Main 2026 Full Ionic Equilibrium list All JEE Main PYQs