QA and Salts Quick Check III

An aqueous solution of an unknown salt gives the following results: Green precipitate forms when added to aqueous sodium hydroxide. White precipitate forms when added to aqueous barium nitrate. Which of the following is the unknown salt?

• FeCl2

• FeSO4

• Fe2(SO4)3

• CuSO4

Aqueous ammonia is added to a solution of a salt. A white precipitate is formed which dissolves in excess aqueous ammonia. Which metal is in the salt?

• aluminium

• calcium

• copper

• zinc

Which could be used to test for the presence of iodide?

• lead(II) nitrate

• copper(II) oxide

• barium nitrate

• silver nitrate

Which of the following in solution will form no precipitate with aqueous ammonia?

• copper (II) chloride

• iron (II) nitrate

• calcium nitrate

• iron (III) nitrate

What gas is formed when magnesium reacts with sulfuric acid (small caps)?

The table shows the results of two tests carried out on separate portions of solution of a salt X. result: blue precipitate soluble in excess to form a dark blue solution with NH3 (aq), white precipitate with BaCl2(aq). Which of the following is the unknown salt?

• calcium chloride

• copper(II) sulfate

• iron(II) sulfate

• zinc sulfate

Which gase(s) will have an effect on damp blue litmus paper?

• ammonia

• carbon dioxide

• chlorine

• sulfur dioxide

A certain metallic ion in aqueous solution produces: White precipitate with sodium hydroxide, soluble in excess to produce a colourless solution. White precipitate with aqueous ammonia, soluble in excess to produce a colourless solution. What is the metallic ion?

• Al3+

• Ca2+

• K+

• Zn2+

A mineral X dissolves in dilute hydrochloric acid, giving off a gas which produces a white precipitate with limewater. When aqueous ammonia is added to the colourless solution, a white precipitate is formed. The precipitate dissolves in excess aqueous ammonia to produce a colourless solution. What is X?

• calcium carbonate

• copper(II) carbonate

• zinc carbonate

• zinc sulfide

An excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. Ammonia gas is ONLY given off after aluminium foil is added to the hot solution. What could X be?

• ammonium chloride

• ammonium nitrate

• sodium chloride

• sodium nitrate