Qualitative Analysis

A solid is insoluble in water but dissolves in aqueous alkali without evolution of a gas. What could the solid be?

• Copper (II) carbonate

• Copper(II) hydroxide

• Zinc carbonate

• Zinc hydroxide

What gas is formed when ammonium chloride is warmed with aqueous sodium hydroxide?

• Ammonia

• Chlorine

• Oxygen

• Hydrogen

Which gas changes damp litmus paper from red to blue?

• Ammonia

• Carbon dioxide

• Chlorine

• Hydrogen

In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?

• Copper (II) nitrate

• Iron(II) nitrate

• Iron(III) nitrate

• Zinc nitrate

Which ion, in aqueous solution, forms a white precipitate when dilute sulfuric acid is added?

• Ag+

• Ba2+

• Cu2+

• Fe2+

A metallic ion in aqueous solution produces

(i) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

(ii) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

What is the metallic ion?

• Al3+

• Ca2+

• K+

• Zn2+

Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?

• Al3+

• Cu2+

• Fe2+

• Fe3+

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could X be?

• Calcium iodide

• Copper(II) chloride

• Lead(II) iodide

• Sodium chloride

A salt is dissolved in water. The results of two separate tests on it are shown in the table.

1. white precipitate which dissolved when excess aqueous ammonia is added.
2. white precipitate is formed when dilute nitric acid and aqueous barium nitrate is added to the salt solution. What is the salt?

• Aluminium chloride

• Aluminium sulfate

• Zinc chloride

• Zinc sulfate

A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with aluminium powder. What ions foes X contain?

• Ammonium and copper(II)

• Ammonium and iron(II)

• Nitrate and copper(II)

• Iron(II) and nitrate