Which element is oxidized and which is reduced in the following reactions? Express your answers as chemical symbols separated by a comma. Enter the oxidized element first.
a. N2(g) + 3H2(g) → 2NH3(g)
b. Cl2(aq) + 2NaI(aq) → I2(aq) + 2NaCl(aq)
c. PbS(s) + 4H2O2(aq) → PbSO4(s) + 4H2O(l)
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