1electrolysis mean conversion of electrical to chemical energy
in electrolysis , we apply an opposite cell potential greater in magnitude of the cell potential so that the proceses having delta G>0 are made spontaneous
so just the opposite happens
Though Zn is at higher position than Hydrogen in electrochemical series ....yet we get Zn at cathode in the electrolysis of ZnSO4 solution...why?
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7 Answers
11Depends on the electrode u take........unreactive electrode (Pt) => H2 is liberated.
Reactive electrode => Depends on the reactivity of the electrode w.r.t Zn [4]
13can u state it...clearly....i am very weak it this portion[3]
11Me too Abhirup.......i just blabbered sumthing to test out my tukka skills........obviously they are not exactly at their best [3]
111but why not a process which has a greater -ve value of ΔG??
1consider the net call reaction as
A + B => C+D
ΔG = -nFE0 <0 as E0>0
when some emf is applied opposite to direction of ell potential then
E = E0 - Eext
when Eext>E0 then E becomes <0 and hence ΔG for forward reaction >0
so ΔG for backward reaction <0 and hence spontaneous