Which element is oxidized and which is reduced in the following reactions  2H2 + O2 > 2H2O  3 Pb(NO3)2 (aq) + 2Cr (s) > 3 Pb (s) + 2Cr(NO3)3 (aq) F2 (aq) + 2KCl (aq) > Cl2 (aq) + 2KF (aq)

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