Ex-2 Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of which type of chemical reaction

CBSE Class 10 Chemistry Chapter 1 - Chemical Reactions and Equations Exercise 2

Fe2O3 + 2Al → Al2O3 + 2Fe

The above reaction is an example of a

(a) combination reaction.

(b) double displacement reaction.

(c) decomposition reaction.

(d) displacement reaction.



Looking at the reaction: Fe2O3 + 2Al → Al2O3 + 2Fe

  • Aluminum (Al) displaces iron (Fe) from iron oxide (Fe2O3)
  • Iron is pushed out of its compound and forms free iron metal
  • Aluminum takes iron's place and forms aluminum oxide (Al2O3)

This follows the general pattern: A + BC → AC + B

Where:

  • A = Al (more reactive metal)
  • BC = Fe2O3 (compound containing less reactive metal)
  • AC = Al2O3 (new compound formed)
  • B = Fe (displaced metal)

Let me check each option:

(a) Combination reaction - This would be A + B → AB (two substances combining to form one). This doesn't fit since we have two products.

(b) Double displacement reaction - This would be AB + CD → AD + CB (two compounds exchanging ions). This doesn't fit since we start with a metal element and a compound.

(c) Decomposition reaction - This would be AB → A + B (one compound breaking into simpler substances). This doesn't fit since we're combining reactants.

(d) Displacement reaction - This is exactly what's happening. A more reactive metal (Al) displaces a less reactive metal (Fe) from its compound.

This is also known as a thermite reaction - a classic example of displacement where aluminum displaces iron from its oxide.

Answer: (d) displacement reaction

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