Select the correct order of solubility of AgCN(s) at `25^(@)C`. Given that at this temperature its solubility is `S_(1)` (in presence of 1 M `AgNO_(3)`) , `S_(2)` (in presence of 1 M `NH_(3) (aq)`) , `S_(3)` (in presence of pure water) and `S_(4)` (in presence of 1.5 M KCN).

Options

A. `S_(1) lt S_(2) lt S_(3) lt S_(4)`
B. `S_(1) lt S_(4) lt S_(2) lt S_(3)`
C. `S_(4) lt S_(1) lt S_(3) lt S_(2)`
D. `S_(3) lt S_(4) lt S_(1) lt S_(2)`

Answer

C

Explanation

Order of solubility `{:(underset(larr "Common ion effect" rarr)(S_(4) lt S_(1)) lt underset(["Pure water"])(S_(3)) lt underset(["reactive ion effect: complex formation"])(S_(2))),((1.5M CN^(-))(1.0M Ag^(+))):}`