please do it all

2. Find E for the reaction 4Fe2+ O2 + 4H* 4Fe3+ + 2H20 a)-1.85 V b) -2.00 V c) 2.00 V * d) 0.46 V 3. Find for the reaction 2Fe3+ + Fe 3Fe2. a) 1.21 V 2b) -0,33 V 2 c) 0.33 V 4d) - 1.21 V 4. Find the standard reduction potential for the half-reaction: X* +X given that Cu + 2X* Cu2+ + 2X E = 0.46 V a) 0.12 V b) -0.12 V c) 0.80 V d) -0.80 V 5. For question (4), what does "X" represent? + a) Tin b) Lead c) Cobalt d) Silver 6. The net reaction of the mercury cell is Zn + HgO + H20 Zn(OH)2 + Hg What substance is oxidized at the anode of this cell? a) Zn b) Hg c) HgO d) 7. The overall reaction of the silver oxide battery, which is used in watches, may be written as Ag2O + Zn 2Ag + ZnO. The cathode of the battery is: . a) Ag b) Zno c) Ag20 . d) Zn 8. The overall reaction of the NiCad battery, used in portable tools, can be written as: 2NIO(OH) + Cd + 2H20 2N (OH)2 + Ca(OH)2 The cathode of this battery is: a) NiO(OH) 2. b) Cd 2. c) Ni(OH)2 d) Ca(OH)2