The Ksp of Ag2CrO4, AgCl, AgBr and AgI are
respectively, 1.1 × 1012, 1.8 × 1010, 5.0 × 1013,
8.3 × 1017. Which one of the following salts will
precipitate last if AgNO3 solution is added to the
solution containing equal moles of NaCl, NaBr, NaI
and Na2CrO4 ?