Correct option is (a) true
The explanation: Yes, we can predict the solubility of a sparingly soluble salt, for example, consider the reaction; AxBy = xA^y+ + yB^x+, the solubility of a sparingly soluble salt is given by x^x.y^y.s^x+y, knowing the values of Ksp, x and y, the solubility of the salt can be calculated.