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The substance that donates electron(s) to the oxidant is being oxidised.
Ag(s)
No. It is reduced since it is a negative ion.
AgAg(s)-
Ag(s)
Ag(s)
Ag(s)
S is oxidized by H2O2.PbS is turned into PbSO4.
Cu(s)
All alkali metals.
Cu(s)
FADH2 only