The K _ sp of CuS , Ag ₂ ~S and HgS are 10⁻³¹, 10⁻⁴⁴ and 10⁻⁵⁴ respectively. The solubility of these sulphides are in the order :

Step-by-step solution

For CuS, solubility = (10⁻³¹ )^ 1 / 2 ; array l For Ag ₂ ~S = ( K _ sp 4 )^ 1 3 = ( 10⁻⁴⁴ 4 )^ 1 3 and for HgS = (10⁻⁵⁴ )^ 1 2 array