Which of the following reactions is an example of double displacement reaction?

Question

Examoogle · Accepted Answer

The correct answer is Option B: $	ext{Na}_2	ext{SO}_4 	ext{(aq)} + 	ext{BaCl}_2 	ext{(aq)} ightarrow 	ext{BaSO}_4 	ext{(s)} + 2	ext{NaCl (aq)}$. A double displacement reaction is a chemical process where two ionic compounds in aqueous solution exchange their ions to form two new compounds. In this case, sodium sulfate and barium chloride swap their anions to form an insoluble white precipitate of barium sulfate.

Step-by-Step Solution & Concepts:
A double displacement reaction is a chemical process where two ionic compounds in aqueous solution exchange their ions to form two new compounds. In this case, sodium sulfate and barium chloride swap their anions to form an insoluble white precipitate of barium sulfate.

Working Principle: The reaction proceeds because the formation of an insoluble solid (a precipitate) drives the reaction to completion. When $Na_{2}SO_{4}(aq)$ and $BaCl_{2}(aq)$ are mixed, the $Ba^{2+}$ ions react with $SO_{4}^{2-}$ ions to form $BaSO_{4}(s)$, while $Na^{+}$ and $Cl^{-}$ ions remain in the solution as aqueous $NaCl$.

Key Formulas: $Na_{2}SO_{4} + BaCl_{2} ightarrow BaSO_{4} + 2NaCl$ — The chemical equation for the double displacement precipitation reaction.

Key Points: Double displacement reactions often result in the formation of a precipitate.; The reactants are typically ionic compounds in their aqueous state.; These reactions are also known as metathesis reactions.; The reaction of $BaCl_{2}$ and $Na_{2}SO_{4}$ is a classic example of a precipitation reaction.

Advantages: Used to identify ions in qualitative analysis (precipitation).; Effective for preparing pure salt compounds.

Disadvantages: Can be difficult to separate the solid product from the solution without specialized filtration.

Applications: Water purification (removing sulfates).; Qualitative chemical analysis in laboratory testing.

Additional Info: The other three options (A, C, and D) represent single displacement reactions, where a more reactive metal displaces a less reactive metal from its salt solution based on the activity series.. In single displacement, only one element switches places, whereas in double displacement, both ionic compounds participate in the exchange.

Answer: B is correct — It represents a double displacement reaction where two ionic species exchange partners to form a solid precipitate.

Exam Tip: Remember that single displacement reactions follow the metal reactivity series, while double displacement reactions are primarily governed by the formation of products like precipitates, gases, or water.

Examoogle · Answer

Option A: $	ext{Fe(s)} + 	ext{CuSO}_4 	ext{(aq)} ightarrow 	ext{FeSO}_4 	ext{(aq)} + 	ext{Cu(s)}$

Examoogle · Answer

Option C: $	ext{Pb(s)} + 	ext{CuCl}_2 	ext{(aq)} ightarrow 	ext{PbCl}_2 	ext{(aq)} + 	ext{Cu(s)}$

Examoogle · Answer

Option D: $	ext{Zn(s)} + 	ext{CuSO}_4 	ext{(aq)} ightarrow 	ext{ZnSO}_4 	ext{(aq)} + 	ext{Cu(s)}$

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