27. The oxidation number of the chromium atom in the CrO42 is: a. +8 b. +6 c. +4 d. +2 e. 2 28. In the redox reaction below: Cu(s)+Ag(aq)Cu2(aq)+Ag(s) a. Cu is reduced d. Cu oxidized b. Ag is reduced e. b and d c. Ag+oxidized U5:2 29. Consider the following reaction: MnO4(n0)+5Fe2+(m)+8H(0)Mn2()+5Fe3+()+4H2O0 In this reaction, the reducing agent is: a. MnO4 b. Fe2+ d. Mn2+ c. H+ c. Fe30 30. Consider the reaction in question 29 again: MnO4()+5Fe2+()+8H()Mn2+(m)+5Fe3+(m0+4H2O0 Identify the oxidizing agent in the reaction: a. MnO4 d. Mn2+ b. Fe2+ e. Fe3 c. H2