A solution contains a mixture of Ag⁺ (0.10 M) and Hg₂²⁺ (0.10 M) which are to be separated by selective precipitation. Calculate the maximum concentration of iodide ion at which one of them gets precipitated almost completely. What % of that metal ion is precipitated?

Ksp of AgI = 8.5 × 10^–17and Ksp of Hg₂I₂ = 2.5 × 10^–26

1)  0.17%
2)  9.983% 
3)  83%.
4)  99.83%