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Using this table

Fe (s) + CuSO4(aq) --> FeSO4 (aq) + Cu(s)

0             +2+6-2              +2+6-2          0 (oxidation numbers)

0              +2+6-8              +2+6-8         0 (total contribution to charge)

What would the answer be for the following?

Pb + CuSO4 --> Cu + PbSO4

                                                     (oxidation numbers)

                                                     (total contribution to charge)

Zn + CuSO4 --> Cu + PbSO4

                                                   (oxidation numbers)

                                                   (total contribution to charge)

Zn + Pb(NO3)2 --> Pb + Zn(NO3)2

                                                           (oxidation numbers)

                                                           (total contribution to charge)

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