D&#17 Determine whether each redox reaction occurs spontane- ously in the forward direction. (a) Ca2+(aq) + Zn(s)-Ca(s) + Zr”(al) (b) 2 Ag+(aq) + Ni(s)–2 Ag(s) + N产(aq) (c) Fe(s) +Mn2 (aą)- Fe (aą)Mn(s) (d) 2 Al(s) + 3 Pb2+(aq) → 2 AP”(aq) + 3 Pb(s) Suppose you wanted to cause Pb ions to come out of solu- tion as solid Pb. What metal could you use to accomplish this? Make a sketch of an electrochemical cell with the overall reaction shown here. Label the anode, the cathode, and the salt bridge. Indicate the direction of electron flow Hint: When drawing electrochemical cells, the anode is usually drawn on the left side Mg(s) + Ni (aq) Mg(a)Nis) 4 The following reaction occurs at the cathode of an electro- chemical cell: Ni (a)2eNi(s) Which anode reaction would produce a battery with the highest voltage? (a) Ag(s) Ag (aą) e (b) Mg(s)Mg (ag) + 2e (c) Cr(s)Cr(aą) 3e (d) Cu(s)Cu (a) 2e Which metal, if coated onto iron, would prevent the corrosion of iron? 5. (a) Mg (b) Cr (c) Cu