In the presence of humic acids (organic macromolecules from dead organisms), Au nanoparticles are deposited on the surface of Ag nanoparticles via a redox reaction called "galvanic replacement" (Alivio, T. E. G., et al. Envi. Sci. Tech. 2018, 52, 7269-7278). The reaction produces Ag+lons in solution as follows: 3Ag(s)+AuCl4(aq.)3Ag+(aq.)+Au(s)+4Cl(aq.) In the above reaction, Ag(s) is into Ag+(aq.),thereforeAg(s) is the a. oxidized, oxidizing agent b. reduced, reducing agent c. reduced, oxidizing agent d. oxidized, reducing agent Which of the following species is amphoteric? a. CH4 b. HC2O4 c. O2 d. ClO2 What mass of bismuth could be deposited by electrolysis of an aqueous solution of Bi i3+ for 155 min using a constant current of 10.0A ? a. 67.1g b. 604g c. 1.12g d. 201g