Question

mix a spatula of iron powder and a spatula of sulphur powder in a crucible. heat the mixture.Observe and record the colour change of a compound. _______-- coloured compound is formed.

Answer 1

Answer:

When sulphur is heated in air it produce sulphur dioxide SO

2

.

(a)(i) SO

2

gas is neutral in nature and thus there will be no change in colour of dry litmus paper.

(ii) SO

2

reacts with water to produce H

2

SO

3

sulphurous acid that being acid turns blue moist litmus red.

Answer 2

Answer:

When sulphur is heated in air it produce sulphur dioxide SO

2

(a)(i) SO 2

gas is neutral in nature and thus there will be no change in colour of dry litmus paper.

(ii) SO 2

reacts with water to produce H 2

SO

3

sulphurous acid that being acid turns blue moist litmus red.

(b) S(s)+O 2(g)→SO 2 (g)SO 2 (g)+H2O(aq)→H 2SO 3(aq)