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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.

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  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
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