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38. The oxidizing agent for the forward reaction in the equation is: Al + NO2^- = Al(OH)4 + NH3. 39. The oxidation number of carbon in the oxalate ion, C2O4^2- is: 40. The oxidation number of C in HC2H3O2 is: 41. When the following skeletal equation, which represents a reaction taking place in basic solution, is balanced using the smallest possible whole numbers, the coefficient of OH^- is: MnO4^- + HSO3^- = MnO4^2- + SO4^2- 42. The oxidizing agent on the given reaction is: Fe2O3 + 3CO = 2Fe + 3CO2. 43. When the following oxidizing-reduction equation representing a reaction that takes place in acidic solution is correctly balanced using the smallest possible whole number coefficients, the coefficient before the Zn is: H3AsO4 + Zn = AsH3 + Zn^2+. 44. In the following reaction, the oxidation number of Fe changes from....... to...........
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