ultiple Choice lentify the choice that best completes the statement or answers the question. 1. If an atom is reduced in a redox reaction, what must happen to another atom in the system? a. It must be oxidized. b. It must be reduced. c. It must be neutralized. d. Nothing needs to happen to another atom in the system. 2. In which of the following types of reaction are electrons gained? a. decomposition b. oxidation c. neutralization d. reduction 3. Which element is reduced in the following reaction? 2PbSO4+2H2OPb+PbO2+2H2SO4 a. lead b. sulfur c. hydrogen d. oxygen 4. Which element is oxidized in the following reaction? 2PbSO4+2H2OPb+PbO2+2H2SO4 a. lead b. sulfur c. hydrogen d. oxygen 5. What is the reducing agent in the following reaction? 2Na+2H2O2NaOH+H2 a. Na b. H2O c. NaOH d. H2 6. What is the oxidizing agent in the following reaction? CH4+2O2CO2+H2O a. CH4 b. O2 c. CO2 d. H2O