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Chemistry

Choose the reaction which is not a chemical change under prevalent condition.

  1. Fe + CuSO4 ⟶
  2. FeCO3 →Δ\xrightarrow{\Delta}
  3. Fe →Δ\xrightarrow{\Delta}
  4. Fe + S →Δ\xrightarrow{\Delta}

Chemical Reaction

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Answer

Fe →Δ\xrightarrow{\Delta}

Reason — Heating iron alone, under prevalent conditions, does not produce a new substance; hence it is not a chemical change. A chemical reaction is a chemical change in which reactants are transformed into new substances called products.

The other reactions are chemical changes:

  1. Fe + CuSO4 → FeSO4 + Cu — displacement reaction
  2. FeCO3 →Δ\xrightarrow{\Delta} FeO + CO2 — thermal decomposition
  3. Fe + S →Δ\xrightarrow{\Delta} FeS — direct combination reaction

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