The increasing order of Ag⁺ ion concentration in

I. Saturated solution of AgCl

II. Saturated solution of Agl

III. 1 M $\text{Ag}{\left({\text{NH}}_3\right)}_2^{+}$  in 0.1 M NH₃

IV. 1 M $\text{Ag}{\left(\text{CN}\right)}_2^{-}$  in 0.1 M KCN

Given :

${\text{K}}_{\text{sp }}\text{of} \text{ AgCl}=1\text{.}0\times 10^{-10}$,

${\text{K}}_{\text{sp}}\text{ of}\text{ AgI}=1\text{.}0\times 10^{-16}$

${\text{K}}_{\text{d}}\text{ of}\text{ Ag}{\left({\text{NH}}_3\right)}_2^{+}=1\text{.}0\times 10^{-8}$

${\text{K}}_{\text{d}}\text{ of}\text{ Ag}{\left(\text{CN}\right)}_2^{-}=1\text{.}0\times 10^{-21}$

• A

  I < II < III < IV
• B

  IV < III < II < I
• Correct answer
  C

  IV < II < III < I
• D

  IV < II < I < III

Hence, the correct answer is option: 'C'.