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Half reaction :

Oxidation

Cu ⇒ Cu²⁺ + 2e⁻

Reduction

2Ag⁺+ 2e⁻ ⇒2Ag  

Further explanation

Given

Reaction

Cu+2AgNO₃⇒Cu(NO₃)₂+2Ag

Required

Oxidation and reduction half-reactions

Solution

Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.

  • Oxidation

Cu ⇒ Cu²⁺ + 2e⁻

0 to +2

  • Reduction

2Ag⁺+ 2e⁻ ⇒2Ag  

+1 to 0