What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer :
(a) Hydrogen gas and iron chloride are produced.
(b) Chlorine gas and iron hydroxide are produced.
(c) No reaction takes place.
(d) Iron salt and water are produced

Correct Answer: (a) Hydrogen gas and iron chloride are produced.

Explanation:  The general reaction between acid and metal

Acid + Metal → Salt + Hydrogen gas (H₂)

When dilute hydrochloric acid is added to iron filings, iron chloride and hydrogen gas are produced.

The chemical reaction is given below:

HCl + Fe → FeCl₂ + H₂ (Unbalanced equation)

2HCl + Fe → FeCl₂ + H₂ (Balanced equation)

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

This is an example of a displacement reaction.

A displacement reaction is one wherein the atom or a set of atoms is displaced by another atom in a molecule. The general equation for displacement reaction is,

A + B-C → A-C + B.

Example: Aluminium displaces iron oxide to form Aluminium oxide and iron is deposited.

 Fe₂O₃ + 2Al → Al₂O₃ + 2Fe.

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Updated on: 14-Mar-2023

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