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In the Daniell cell, the overall cell reaction is
AZn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)
BZn²⁺ + Cu → Zn + Cu²⁺ (typical)
C2H⁺ + 2e⁻ → H₂
DCl₂ + 2e⁻ → 2Cl⁻
Answer & Solution
Correct answer: A. Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)
1. At the Zn anode: Zn → Zn²⁺ + 2e⁻ (oxidation).
2. At the Cu cathode: Cu²⁺ + 2e⁻ → Cu (reduction).
3. Adding the half-reactions gives the overall cell reaction Zn + Cu²⁺ → Zn²⁺ + Cu.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 5 "Electrochemistry" §5.2_
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