Question

In which of the following electrochemical cell the overall cell reaction is:
$Zn(s) + H_{2}SO_{4} (aq) \to ZnSO_{4} (aq) + H_{2} (g)$

• A. $Zn | H_{2}SO_{4} (aq) | H_{2} (g) | Pt$
• B. $Zn | ZnSO_{4} (aq) | H_{2} (g) | Pt$
• C. $Zn | ZnSO_{4} (aq) | H_{2}SO_{4} (aq) | H_{2} (g) | Pt$
• D. $Zn | ZnSO_{4} (aq) || H_{2}SO_{4} (aq) | H_{2} (g) | Pt$

Answer 1

Answer: (D)

For the cell: $Zn | ZnSO_{4} (aq) || H_{2}SO_{4} (aq) H_{2} (g) | Pt$
LHE reaction: $Z n \to Zn^{2+} + 2e$
RHE reaction: $2H^{+} + 2e \to H_{2}$
Net reaction: $Zn + 2H^{+} \to Zn^{2+} + H_{2}$
or $Zn (s) + H_{2}SO_{4} (aq) \to ZnSO_{4} (aq) + H_{2} (g)$