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Following oxidation-reduction reaction by using the oxidation state method

a) O2+H2O+Pb=Pb(OH)2

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basic solution.
Pb + 2OH^- ==> Pb(OH)2 + 2e
O2 + 4e + 2H2O ==> 2OH^- + 2OH^-

Multiply equation 1 by 2 and equation 2 by 1 and add. Cancel any ions/molecules common to both sides.
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