When mercuric iodide is added to the aqueous solution of potassium iodide

HgI2 is a solid 4 ions (2K+,2I-)                           3 ions(2K+,1[HgI4]-2As number of particles decreases during the process, colligative properties decreases  VP of the solution , increases      BP of the solution , decreases     FP of the solution , increases     O.P of the solution , decreases( O.P = osmatic pressure)