QA ILD

Aqueous sodium hydroxide and aluminium were added to the unknown solution. The mixture was then warmed and the gas tested. The result is shown in the picture. This is the test for

• ammonium.

• lead.

• carbonate.

• nitrate.

Name the gas present.

• oxygen

• hydrogen

• ammonia

• sulfur dioxide

When a filter paper dipped in acidified potassium manganate (VII) was brought to a test tube with sulfur dioxide,

• the purple colour remains

• the purple colour changes to blue

• the purple colour changes to red

• the purple colour changes to colourless

The gas present is

(a)  

Sodium hydroxide and ammonia were added to an unknown substance X. The results are as shown. NAME the cation present.

(a)  

Aqueous sodium hydroxide and aluminium were added to the unknown solution. The mixture was then warmed and the gas tested. The result is shown in the picture. This is the test for

• ammonium.

• lead.

• carbonate.

• nitrate.

Damp blue litmus is bleached. This shows the presence of

• carbon dioxide.

• chlorine.

• sulfur dioxide,

• oxygen

Sodium hydroxide (aq) was added in excess to test tubes A, B and C which contain different salts.

The cations present are

• iron(II), copper(II) and zinc

• iron(III), copper(II) and calcium

• iron(II), lead(II) and ammonium

• iron(II), copper(II) and calcium

Name the precipitate in A.

(a)  

Name the precipitate in B.

(a)