The Ks of Ag2CrO4, AgCl, AgBr, and AgI are respectively 1.1 x 10-12, 1.8 x 10-6, 5.0 x 10-13 and 8.3 x 10-17. Which of the following salts will precipitate last of AgNO3 solution containing equal moles of NaCl, NaBr, Nal and Na2CrO4.
(a) AgBr
(b) Ag2CrO4
(c) AgI
(d) AgCl