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Consider the equilibrium obtanied by el...

Consider the equilibrium obtanied by electrically connecting zinc amalgam electrodes in mercury cell,
`Zn(Hg) + HgO(s) rarr ZnO (S) +Hg(l)`
Under this equilibrium what is the relation between the potential of the Zn(Hg) and HgO electrodes measured against the standard hydrogen electrode

A

Zn (Hg) electrode potential is equal to HgO electrode potential

B

Zn(Hg) electrode potential is more than HgO electrode potential

C

Hgo electrode potential is more than Zn(Hg) electrode

D

cell voltage at above said equilibrium is 1.35 v

Text Solution

Verified by Experts

The correct Answer is:
A
Since at equilibrium `E_(cell)^(@)` =zero
at equilibrium
`E_("cathode")^(@)=E_("anode")^(@)` i.e
electrode potential of Zn (Hg) electrode must be equal to the Hgo electrode
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