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Which of the following is/are the example/s of double displacement reaction? (1) C(s)+O2тАЛ(g)тЖТCO2тАЛ(g) (2) Na2тАЛSO4тАЛ(aq)+BaCl2тАЛ(aq)тЖТBaSO4тАЛ(s)+2NaCl(aq) (3) Pb(s)+CuCl2тАЛ(aq)тЖТPbCl2тАЛ(aq)+Cu(s) (4) CaCO3тАЛ(s)тЖТCaO(s)+CO2тАЛ(g)
1 and 4 only
1, 2 and 3 only
Only 2
2 and 3 only
Only 2
A double displacement reaction occurs when two aqueous ionic compounds exchange their constituent ions to form two new compounds. In the given reaction, Na2тАЛSO4тАЛ(aq)+BaCl2тАЛ(aq)тЖТBaSO4тАЛ(s)+2NaCl(aq), the sulfate ions and chloride ions swap partners, resulting in the formation of a white precipitate of barium sulfate, which identifies it as a precipitation reactionтАФa type of double displacement.
A double displacement reaction occurs when two aqueous ionic compounds exchange their constituent ions to form two new compounds. In the given reaction, Na2тАЛSO4тАЛ(aq)+BaCl2тАЛ(aq)тЖТBaSO4тАЛ(s)+2NaCl(aq), the sulfate ions and chloride ions swap partners, resulting in the formation of a white precipitate of barium sulfate, which identifies it as a precipitation reactionтАФa type of double displacement.
Think of it like two couples dancing who decide to switch partners mid-dance: person A moves to dance with person D, and person C moves to dance with person B.
Double Displacement: 'The great partner swap.'
Na2тАЛSO4тАЛ(aq)+BaCl2тАЛ(aq)тЖТBaSO4тАЛ(s)+2NaCl(aq) тАФ The chemical equation for the precipitation of barium sulfate
In this reaction, the positive cation Ba2+ from barium chloride reacts with the negative anion SO42тИТтАЛ from sodium sulfate to form an insoluble solid, BaSO4тАЛ. Simultaneously, Na+ and ClтИТ ions combine to remain in the aqueous phase as NaCl. This mutual exchange of ions is the fundamental mechanism of a double displacement (or metathesis) reaction.
Double displacement involves the exchange of ions between two reactants.
Often leads to the formation of an insoluble product called a precipitate.
Equation (1) is a combination reaction (oxidation).
Equation (3) is a single displacement reaction (displacement of copper).
Equation (4) is a thermal decomposition reaction.
Used in analytical chemistry to identify specific ions in a solution through precipitation.
Not all double displacement reactions produce a visible change; some involve water formation (neutralization) that requires indicators.
Precipitation of barium sulfate to remove sulfate ions from water.
Neutralization of acids and bases.
Equation (1): C+O2тАЛтЖТCO2тАЛ is a combination reaction.
Equation (3): Pb+CuCl2тАЛтЖТPbCl2тАЛ+Cu is a displacement reaction where lead displaces copper due to higher reactivity.
Equation (4): CaCO3тАЛтЖТCaO+CO2тАЛ is a decomposition reaction.
C is correct тАФ Only equation (2) is a double displacement reaction because it involves the mutual exchange of ions between two ionic compounds.
Always check for the state symbols. If a reaction produces a solid (s) from two aqueous (aq) solutions, it is almost certainly a double displacement/precipitation reaction.
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