Order of solubility of sodium halides and potassium iodide
The order b-a-d-c is correct, if the solubility is in gramm per liter. If it is in mole per liter, the order is a&gt;b&gt;c&gt;d, as the saturated solutions of NaBr is the highest ($8.78~ mol L^{-1}$), then KI ($8.48~ mol L^{-1}$), then NaCl ($6.19~ mol L^{-1}$), and NaF ($0.95~ mol L^{-1}$)