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COMEDK · Chemistry · 18. Electrochemistry

Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.

No.Anodic ReactionNo.Cell
A\(Zn(Hg) + 2OH^- \to ZnO_{(s)} + H_2O + 2e^-\)PFuel cell
B\(2H_2(g) + 4OH^- \to 4H_2O(l) + 4e^-\)QLeclanche cell
C\(Zn_{(s)} \to Zn^{2+} + 2e^-\)RNickel Cadmium storage cell
D\(Cd_{(s)} + 2OH^- \to CdO_{(s)} + H_2O(l) + 2e^-\)SMercury cell

  1. A \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}\)
  2. B \(\mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{R}\)
  3. C \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{R} \quad \mathrm{D}=\mathrm{Q}\)
  4. D \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R}\)

Step-by-step Solution

Detailed explanation

The anodic reaction \(\mathrm{Zn}(\mathrm{Hg})+2 \mathrm{OH}^{-} \rightarrow \mathrm{ZnO}_{(\mathrm{S})}+\mathrm{H}_2 \mathrm{O}+2 e\) occurs in the Mercury cell (S). The anodic reaction \(2 \mathrm{H}_2(g)+4 \mathrm{OH}^{-} \rightarrow 4 \mathrm{H}_2 \mathrm{O}(l)+4 e\) occurs…