Question

When a mixture of iron filings and sulphur are heated, a red glow spreads through the mixture and a dark grey solid was formed.

1. Identify the dark grey solid formed.
2. Write a chemical equation in which the dark grey solid is formed. 
3. What observation can be made when dark grey solid reacts with dilute hydrochloric acid.

Answer 1

1. Iron (II)  sulphide 
2. Fe_(s)  +  S_(s)  →  FeS 
3.   
   • A gas with rotten egg smell is produced 
   • A pale green solution is formed