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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which reaction is NOT a displacement reaction?
Na + H₂O ⇒ NaOH + H₂
Zn + H₂SO₄ ⇒ ZnSO₄ + H₂
Fe + CuSO₄ ⇒ FeSO₄ + Cu
HCl + NaOH ⇒ NaCl + H₂O
HCl + NaOH ⇒ NaCl + H₂O
A displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution. Option D represents a neutralization reaction, not a displacement reaction, because it involves the exchange of ions to form water and salt without any element being displaced from its elemental state.
A displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution. Option D represents a neutralization reaction, not a displacement reaction, because it involves the exchange of ions to form water and salt without any element being displaced from its elemental state.
A displacement reaction is like a stronger person taking the seat of a weaker person on a bench. A neutralization reaction is more like two people swapping seats or joining hands to balance their energy, where no one is kicked off the bench.
Acid+Base→Salt+Water
MetalA+SaltB→SaltA+MetalB
In displacement reactions, a high-reactivity metal pushes a low-reactivity metal out of its compound (e.g., Fe+CuSO4→FeSO4+Cu). Neutralization reactions follow the form Acid+Base→Salt+Water, which is a double decomposition or double displacement reaction involving the transfer of protons (H+) and hydroxyl ions (OH−), not the displacement of a metal by another metal.
Displacement reactions depend on the reactivity series of metals.
Neutralization is a specific type of double displacement reaction.
In single displacement, the oxidation state of the metal changes.
In neutralization, no element changes its oxidation state.
Extraction of metals from ores
Thermite welding process
| Feature | A, B, C | D |
|---|---|---|
Process Type | Single Displacement | Neutralization |
The reactivity series follows: K>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Au.
In option C, Fe is more reactive than Cu, hence it displaces Cu from CuSO4.
D is correct — HCl + NaOH => NaCl + H₂O is a neutralization reaction, not a single displacement reaction.
Remember that displacement reactions require one species to be a pure element. If both reactants are compounds (like acid and base), it is typically double displacement or neutralization.