Question
Question: In which of the following electrochemical cell the overall cell reaction is : Zn(s) + H<sub>2</sub>...
In which of the following electrochemical cell the overall cell reaction is :
Zn(s) + H2SO4 (aq) ¾® ZnSO4 (aq) + H2 (g)
A
Zn | H2SO4 (aq) | H2 (g) | Pt
B
Zn | ZnSO4 (aq) | H2 (g) | Pt
C
Zn | ZnSO4 (aq) | H2SO4 (aq) | H2 (g) | Pt
D
Zn | ZnSO4 (aq) || H2SO4 (aq) | H2 (g) | Pt
Answer
Zn | ZnSO4 (aq) || H2SO4 (aq) | H2 (g) | Pt
Explanation
Solution
For the cell : Zn | ZnSO4 (aq) || H2SO4 (aq) |
H2 (g) | Pt
LHE reaction : Zn ¾® Zn2+ + 2e
RHE reaction : 2H+ + 2e ¾® H2
Net reaction : Zn + 2H+ ¾® Zn2+ + H2
or Zn (s) + H2SO4 (aq) ¾® ZnSO4 (aq) + H2 (g)