I am studying for a test next tuesday, and I am having trouble on a couple of questions. The questions are.... Question 1: Which of the following compounds would you expect to have to undergo electrolysis to obtain free metals? explain your choice. a. KCl b. Ag2O c. Fe2O3 The teacher said to use a chart of reduction potentials to find out if the metal can be replaced in a single replacement reaction, but I can't figure out how to do that. Question 2: Explain why corresponding phosphorus and arsenic compounds resemble each other more closely than they do nitrogen compounds. I have searched my text book and even looked online, but I still can't find anything on this. I even asked the teacher for help, but all he does is makes it more confusing. Can anyone help?