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Balance the following in acidic solution. (Omit states-of-matter from your answer. Use the lowest possible whole...

Balance the following in acidic solution. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.

Oxidation reaction, Reduction reaction, Net reaction for all 3

(a) Hg + PbO2 → Hg22+ + Pb2+

b) H2O2 + Mo2+ → H2O + Mo4+

c) Al + Cr2O72− → Al3+ + Cr3+

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