When H2S gas is passed through the HCl containing aqueous solutions of CuCl2, HgCl2, BiCl3 and CoCl2, which does not precipitate out (a) CuS (b) HgS (c) Bi2S3 (d) CoS BiCl3 and CoCl2 HgCl2 When H2S gas is passed through the HCl containing aqueous solutions of CuCl2 which does not precipitate out (a) CuS (b) [...]