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