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Single replacement reactions

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For variable metals in products, assume they chose 2+ charge.

If the following single replacement reactions will occur, write and balance them. If not, write NR

a. Pb + Sn(NO3)2
b. H2 + NiSO4
c. Cr + Ni(NO2)2
d. H2 + Au PO4

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Spontaneous oxidation-reduction reactions convert the stronger of a pair of oxidizing agents and the stronger of a pair of reducing agents into a weaker oxidizing agent and a weaker reducing agent.

a. Pb + ...

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The solution provides detailed explanations and answer for the problem. The single replacement reactions are discussed. It also provides a reference source.