2H - (aq) + 2e → H 2(g)
Cu2+ (aq) + 2e → Cu (s)
4OH (aq) -4e → 2H2O(l) + O2 (g)
SO4(aq)2 -2e → SO 2(g) + O2(g)
Correct answer is C
No explanation has been provided for this answer.
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