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Solution of problem 624 of the collection on general ch
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624. Write the equations for the half reactions of oxidation and reduction for the following reactions and determine in which cases hydrogen serves as an oxidizer and in which as a reducing agent:
A) 2Al + 6HCl = 2AlCl3 + 3H2
B) 2H2 + O2 = 2H2O
C) 2Na + 2H2O = NaOH + H2
D) BaH2 + 2H2O = Ba (OH) 2 + 2H2
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