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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)