Which of the following chemical reactions represents the displacement reaction?

Question

Examoogle · Accepted Answer

The correct answer is Option D: $	ext{Zn}(s) + 	ext{CuSO}_4(aq) ightarrow 	ext{ZnSO}_4(aq) + 	ext{Cu}(s)$. A displacement reaction is a chemical process where a more reactive element displaces a less reactive element from its aqueous salt solution. In this reaction, zinc, being higher in the reactivity series than copper, replaces copper from the copper sulfate solution.

Step-by-Step Solution & Concepts:
A displacement reaction is a chemical process where a more reactive element displaces a less reactive element from its aqueous salt solution. In this reaction, zinc, being higher in the reactivity series than copper, replaces copper from the copper sulfate solution.

Working Principle: The reaction follows the principle of chemical reactivity where a metal with a higher oxidation potential acts as a reducing agent. Zinc ($Zn$) loses two electrons to form $Zn^{2+}$ ions, while copper ions ($Cu^{2+}$) gain those electrons to deposit as solid copper metal. This is essentially a single displacement reaction classified under redox processes.

Key Formulas: $Zn(s) + CuSO_4(aq) ightarrow ZnSO_4(aq) + Cu(s)$ — the balanced displacement reaction

Key Points: Displacement reactions are based on the Metal Reactivity Series.; A more electropositive metal displaces a less electropositive metal from its salt solution.; The reaction involves the transfer of electrons, making it a redox reaction.

Advantages: Used to extract metals from ores.; Foundational in electroplating and metal recovery processes.

Applications: Extraction of metals like copper and silver.; Production of galvanized steel.

Additional Info: Option A ($2AgCl ightarrow 2Ag + Cl_2$) is a decomposition reaction.. Option B ($C + O_2 ightarrow CO_2$) is a combination reaction.. Option C ($CaO + H_2O ightarrow Ca(OH)_2$) is a combination reaction.

Answer: D is correct — the reaction between zinc and copper sulfate is a classic example of a single displacement reaction where zinc displaces copper.

Exam Tip: Memorize the reactivity series (K, Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au) to quickly identify which metal can displace another in exams.

Examoogle · Answer

Option A: $2	ext{AgCl}(s) ightarrow 2	ext{Ag}(s) + 	ext{Cl}_2(g)$

Examoogle · Answer

Option B: $	ext{C}(s) + 	ext{O}_2(g) ightarrow 	ext{CO}_2(g)$

Examoogle · Answer

Option C: $	ext{CaO}(s) + 	ext{H}_2	ext{O}(l) ightarrow 	ext{Ca(OH)}_2(aq)$

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