Qualitative Analysis Quiz II

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 chloride ions in hydrochloric acid?

• calcium carbonate

• copper(II) oxide

• barium nitrate

• silver nitrate

Which of the following in solution will form a yellow precipitate with aqueous lead(II) nitrate?

• ammonium chloride

• copper(II) nitrate

• potassium iodide

• sodium carbonate

What is the name of the gas (small caps) is formed when aluminium powder is heated with alkaline aqueous sodium nitrate?

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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

Aqueous sodium hydroxide reacts with a metal ion producing a green precipitate. This precipitate turns reddish-brown on standing. What is the ion present?

• Al3+

• Cu2+

• Fe2+

• Fe3+

Which compound in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess aqueous ammonia is added?

• copper(II) sulfate

• iron(II) chloride

• potassium hydroxide

• zinc chloride

A white compound produces a mixture of gases when heated. This mixture turns moist universal indicator paper red and relights a glowing splint. What does this mixture contain?

• sulfur dioxide and hydrogen

• carbon dioxide and oxygen

• ammonia and hydrogen

• hydrogen and oxygen

Tests on a sample of polluted water from a factory gave the following result: white precipitate formed when barium chloride (aq) was added. Which ion is present in the water?

• chloride

• nitrate

• carbonate

• sulfate