11Me too Abhirup.......i just blabbered sumthing to test out my tukka skills........obviously they are not exactly at their best [3]
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]
11
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
11but 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