Which colour precipitate is obtained when the silver nitrate solution is added to dilute hydrochloric acid?

Q. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

Q. When barium chloride solution is added to salt solution E, a white precipitate insoluble in dilute hydrochloric acid is obtained. Identify the anion present in the compound.

Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute sulphuric acid, but gives no precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution consists of: