306 Redox Reactions 19. Standard electrode potentials of redox couples A2/A, B2-/B, C/c2+ and 2/D are 0.3 V, -0.5 V, -0.75 V and 0.9 V respectively. Which of these is best oxidising agent and reducing agent respectively? (1) D2/D and B2 /B (3) D D and C2/C (2) B2/B and D2"/D 4) C?IC and D?D 20. The number of moles of H,O 2 required to ct with 400 ml of 0.5 N KMnO in 22 5.

306 Redox Reactions 19. Standard electrode potentials of redox couples A2/A, B2-/B, C/c2+ and 2/D are 0.3 V, -0.5 V, -0.75 V and 0.9 V respectively. Which of these is best oxidising agent and reducing agent respectively? (1) D2/D and B2 /B (3) D D and C2/C (2) B2/B and D2"/D 4) C?IC and D?D 20. The number of moles of H,O 2 required to ct with 400 ml of 0.5 N KMnO in 22 5. 19. Standard electrode potentials of redox couples A2*/A. B2*/B, C/C2* and D2*/D are 0.3 V, -0.5 V, —0.75 V and 0.9 V respectively. Which of these is best oxidising agent and reducing agent respectively? (2) B2*/B and D2*/D (1) D2+/D and (3) D2+/D and (4) and D241D 4.