Ex-3 What happens when dilute hydrochloric acid is added to iron fillings?

 CBSE Class 10 Chemistry Chapter 1 - Chemical Reactions and Equations Exercise 3

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

(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.

Iron is a moderately reactive metal that can displace hydrogen from dilute acids. The reaction that occurs is:

Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)

Breaking this down:

  • Iron fillings react with hydrochloric acid
  • Iron displaces hydrogen from the acid
  • This produces iron(II) chloride (FeCl2) and hydrogen gas
  • You would observe bubbling as hydrogen gas is released

Let me check each option:

(a) Hydrogen gas and iron chloride are produced - CORRECT This matches exactly what happens: H2(g) is evolved and FeCl2 (iron chloride) is formed.

(b) Chlorine gas and iron hydroxide are produced - INCORRECT Chlorine gas is not produced in this reaction, and iron hydroxide would only form in basic conditions, not acidic.

(c) No reaction takes place - INCORRECT Iron does react with dilute HCl since iron is above hydrogen in the reactivity series.

(d) Iron salt and water are produced - INCOMPLETE While an iron salt (FeCl2) is produced, water is not a product of this reaction. Also, this option doesn't mention the hydrogen gas, which is a key observable product.

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


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