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In wich of the following electrochemical...

In wich of the following electrochemical cell the overall cell reaction is :
`Zn(s) + H_2SO_4 (aq)rarr ZnSO_4 (aq) +H_2(g)`

A

` Zn|H_2SO_4(aq) |H_2(g) |Pt`

B

` Zn|H_2SO_4(aq) |H_2(g) |Pt`

C

`Zn|ZnSO_4(aq)|H_2SO_4(aq)|H_2(g)|Pt`

D

`Zn|ZnSO_4(aq)|H_2SO_4(aq)|H_2(g)|Pt`

Text Solution

Verified by Experts

The correct Answer is:
D
For the cell: `Zn|ZnSO_4 (aq) ||H_2SO_4(aq)|H_2(g)|Pt`
LHE reaction: `Zn rarr Zn^(2+) +2e`
RHE reaction : `2H^(+) +2e rarr K_2`
Net reaction: `Zn+e2H^+ rarr Zn^+ + H_2`
or `Zn(s) + H_2SO_4 (aq)rarr ZnSO_4 (aq) = H_2(g)`
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