38. The oxidation number of S in K2SO4 is A) +6 B) +4 C) +2 D) E) None of the above. –1 39. Which of the following equations does not represent an oxidation-reduction reaction? A) 3Al + 6HCl 3H2 +  B) 2H2O 2H2 + O2  C) 2NaCl + Pb(NO3)2 PbCl2 + 3NaNO3  D) 2NaI + Br2 + I2  E) Cu(NO3)2 + Zn Zn(NO3)2 + Cu  40. Identify the reducing agent in the following chemical reaction. Cd + NiO2 + 2H2O Cd(OH)2 + Ni(OH)2  A) Cd B) NiO2 C) H2O D) Cd(OH)2 E) Ni(OH)2
38. The oxidation number of S in K2SO4 is A) +6 B) +4 C) +2 D) –1 E) None of the above. 39. Which of the following equations does not represent an oxidation-reduction reaction? A) 3Al + 6HCl  3H2 + B) 2H2O  2H2 + O2 C) 2NaCl + Pb(NO3)2  PbCl2 + 3NaNO3 D) 2NaI + Br2  + I2 E) Cu(NO3)2 + Zn  Zn(NO3)2 + Cu 40. Identify the reducing agent in the following chemical reaction. Cd + NiO2 + 2H2O  Cd(OH)2 + Ni(OH)2 A) Cd B) NiO2 C) H2O D) Cd(OH)2 E) Ni(OH)2
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