AP MCQ 04GHI PART 1 Question 01: In the ion, HAsO42-, what is the oxidation number of arsenic? -2 +4 +5 -5 Question 02: When the half-reactions shown below are combined, what is true of the resulting REDOX reaction? Zn ⇌ Zn2+ + 2e- Cu2+ + 2e- ⇌ Cu Four electrons are transfered in the reaction Zinc metal is reduced Zinc ions are reduced Copper ions are reduced Question 03: In the reaction between thiosulfate ions (S2O32-) and iodine, the sulfur species is converted to S4O62- and the iodine is converted to iodide ions. Which statement regarding the reaction is true? The oxidation number of sulfur is the same in the reactants and products I atoms are oxidized The oxidation number of iodine changes from 0 to -1 The reaction is not a REDOX reaction Question 04: In which of the following does the metal have the same oxidation state? MnO4- and MnO2 MnO4- and MnO42- CrO42- and Cr2O72- [Fe(CN)6]4- and [Fe(NO3)4]- Question 05: When manganate(VII) ions are reduced to Mn2+ ions in acid solution, how many electrons are transferred? 2 5 7 One cannot know without the corresponding oxidation half-reaction Question 06: When iron metal is added to a solution of copper(II) sulfate, which statement is true? A REDOX reaction takes place The copper ions are oxidized The copper ions are spectators Sulfate ions precipitate out Question 07: Which of the following reactions could be described as displacement? Sodium + Chlorine → Sodium chloride Hydrogen peroxide → Hydrogen + Oxygen The disproportionation of ClO3- to give hypochlorite ions and chloride ions Zinc + Sulfuric acid → Zinc sulfate + Hydrogen Question 08: In the following reaction, which species is acting as an acid in the REVERSE (right to left) reaction? NH3 + H2O ⇌ NH4+ + OH- NH3 OH- H2O NH4+ Question 09: How many moles of hydroxide ions are present, and on which side of the equation, when the half-reaction below is balanced in BASIC solution, using the smallest possible integers? MnO4- → MnO2 2 on the reactant side 2 on the product side 4 on the reactant side 4 on the product side Question 10: Which of the following reactions represents both an Acid-Base neutralization, AND a precipitation reaction? Hydrochloric acid + Sodium hydroxide Lead(II) nitrate + Sodium chloride Sulfuric acid + Barium hydroxide Sulfuric acid + Potassium hydroxide Δ