Respuesta :

Answer:

Nitrogen atom

Explanation:

  • Oxidation and reduction in a equation can be shown using oxidation numbers.
  • Oxidation number of Oxygen in KNO3 is -2 while in O2 is 0; this indicates reduction.
  • Oxidation number of Nitrogen (N) in KNO3 is + 5, while in KNO2 is +3 , this indicates oxidation.

Hence;

  • Nitrogen  has undergone reduction while oxygen has undergone oxidation and therefore, nitrogen is the oxidizing agent and oxygen is the reducing agent.