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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
Find the concentration of ion which is first precipitated at the point when the third ion starts precipitating, if $AgNO_3$ is added gradually to the solution that contains $0 .1\ M\  Cl^-, 0 .1\  M\ Br^-$ and $0. 1\ M\ I^-$

Given that

Salt            ||         $K_{sp}$

$AgCl$        ||        $2 \times {10^{ - 10}}$

$AgBr$       ||       $5 \times {10^{ - 13}}$

$Ag$           ||        $9 \times {10^{ - 17}}$

  • A
    $2.5 \times {10^{ - 3}}$
  • B
    $4.5 \times {10^{ - 8}}$
  • C
    $1.8 \times {10^{ - 4}}$
  • D
    $5 \times {10^{ - 6}}$
✓

Answer

b$AgI$ will precipitate first, followed by $AgBr$ and $AgCl$. So, for precipitation of $Cl^-$

$\left[ {{\text{A}}{{\text{g}}^ + }} \right] \geqslant \frac{{2 \times {{10}^{ - 10}}}}{{0.1}}$

$ \simeq $ $2 \times 10^{-9}$

$\therefore [I^-] \leq \frac{9 \times 10^{-17}}{2 \times 10^{-9}}  \simeq  4.5 \times 10^{-8}$

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