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Solved for 12^th 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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