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Which element is reduced or oxidized in the reactions: Si(s) + 2 Cl2(g) =SiCl4(I) Cl2(g) +...

Which element is reduced or oxidized in the reactions:

Si(s) + 2 Cl2(g) =SiCl4(I)

Cl2(g) + 2 NaBr(aq) = Br29(ag) +2 NaCl(aq)

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