In what direction will the reaction proceed if all substances are taken under standard conditions: NiO (k) + Pb (k) = Ni (k) + PbO (k)?
Li → Rb → K → Ba → Sr → Ca → Na → Mg → Al → Mn → Cr → Zn → Fe → Cd → Co → Ni → Sn → Pb → H → Sb → Bi → Cu → Hg → Ag → Pd → Pt → Au (reducing capacity decreases)
According to the electrochemical series of metal activities indicated above, Pb is a less active metal than Ni. This means that Pb cannot reduce Ni from oxides. Accordingly, the direct reaction NiO + Pb – will not take place.
Conclusion: the reaction NiO (k) + Pb (k) = Ni (k) + PbO (k) will proceed in the opposite direction, since Ni is a more active reducing agent than Pb.
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