Which of the following is/are correct about the solubility ?

Options

A. Solubility of `CaF_2 ` is more in buffer solution of pH = 3 than in pure water
B. Solubility of ZnS in water depends upon the pH of solution
C. Solubility of AgCl increases in the presence of sodium thiosulphate
D. Solubility of ZnS in the presence of `H^(+) ` ion can be derived by `K= ([Zn^(2+) ][H_2S])/([H^(+) ]^(2)) ` where K is equilibrium constant for the reactions `ZnS_(s) +2H _(aq) ^(+) hArr Zn_((aq) )^(2+) +H_2S_((aq))`

Answer

A, B, C, D

Explanation

In acid solution `F^(-) ` is removed
(b) ` S^(2-) ` reacts with ` H^(+) `
( c ) ` Zns hArr 2n^(+2) + S^(2-) , KsP `
` (H_2S hArr 2H^(+) +S^(2-) ,Ka)/( Zns +2H^(+) hArr Zn^(+2) +H_2S, K =(Ksp)/(Ka))`