IGCSE Analysis

What colour is Fe(OH)₂?

• red

• green

• brown

• blue

What is the best test for sulfate ions?

• add hydrochloric acid followed by barium chloride solution

• add sodium hydroxide followed by barium chloride solution

• add barium chloride solution

• add barium sulfate solution

Barium sulfate is a ...

• yellow soluble solid

• yellow insoluble solid

• white soluble solid

• white insoluble solid

The test for ammonium ions involves adding sodium hydroxide, heating and testing for the vapour that is formed. The test for the gas...

• ...involves bubbling the gas through limewater, which goes cloudy

• ...involves using a glowing splint, which relights

• ...involves using damp red litmus paper, which goes blue

• ...involves using damp blue litmus paper, which goes red

Nitric acid followed by a solution of silver nitrate are aded to a solution of sodium chloride. What will be observed?

• A cream precipitate

• A white precipitate

• A blue precipitate

• A yellow precipitate

A compound gives a yellow flame test and fizzes when hydrochloric acid is added. The compound might be

• NaCl

• Na₂CO₃

• CaCO₃

• Na₂SO₄

A compound gives a blue precipitate when sodium hydroxide is added. When a solution of hydrochloric acid followed by barium chloride is added a white precipitate is observed. The compound is likely to be

• Iron(II) chloride

• Copper(II) chloride

• Iron(II) sulfate

• Copper(II) sulfate

A compound gives a dirty green precipitate when sodium hydroxide is added and a yellow precipitate after nitric acid and silver nitrate are added. The compound is likely to be

• Iron(III) iodide

• Iron(II) chloride

• Sodium iodide

• Iron(II) iodide

Which of these flame test results is NOT correct?

• lithium burns red

• copper (II) burns blue/green

• calcium burns yellow

• potassium burns lilac

What is added to test for carbonate ions and what do you observe?

• sodium hydroxide, white ppt

• dilute hydrochloric acid, blue ppt

• dilute hydrochloric acid, effervescence

• sodium hydroxide, effervescence