In HS^$$-$$, I^$$-$$, R $$-$$ NH₂, NH₃ order of proton accepting tendency will be

Ionisation constant of CH₃COOH is 1.7 $$ \times $$ 10^$$-$$5 and concentration of H⁺ ions is 3.4 $$ \times $$ 10^$$-$$4. Then find out initial concentration of CH₃COOH molecules.

Solubility of M₂S salt is 3.5 $$ \times $$ 10^$$-$$6 then find out solubility product.

Correct relation between dissociation constants of a dibasic acid is