What happens when dilute hydrochloric acid is added to iron fillings? 

• 1. Hydrogen gas and Iron chloride are produced.
• 2. Chlorine gas and Iron hydroxide are produced.
• 3. No reaction takes place.
• 4. Iron salt and water are produced.

1. Hydrogen gas and Iron chloride are produced.

Explanation: The Chlorine from Hydrogen chloride is displaced by the Iron fillings to undergo the following reaction.

2HCl + Fe → FeCl2 + H2