Asked by Harshita | 7th May, 2017, 12:03: PM

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Solved for 12th query, first three reactions
(i) Zn + Pb2+ → Zn2+ + Pb
Reduction half reaction :   Pb2+  +  2e-  →  Pb
Oxidation half reaction :  Zn  →  Zn2+  + 2e-
(ii) Zn + Cu2+ →  Zn2+ + Cu 
Reduction half reaction  :  Cu2+  + 2e- →  Cu
Oxidation half reaction  :  Zn  →  Zn2+  + 2e-
(iii) Cl2 + 2Br-  →  Br2 + 2Cl-
Reduction half reaction  :  Cl2 +  2e-  →   2Cl-
Oxidation half reaction  :  2Br-  →  Br2 + 2e-


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Answered by Prachi Sawant | 11th May, 2017, 04:08: PM

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