Question

relation between oxidised substance and oxidising agent in redox reaction

Answer 1

Oxidation is a process in which any of the following can occur- 

1. loss of Electrons.

2. removal of Hydrogen.

3. Addition of Oxygen.

Oxidizing Agent is a substance that oxidizes any other substance.In return the Oxidizing Agent gets reduced. Examples - KMnO4, K2Cr2O7, OsO4.The oxidizing agent causes oxidation of other compound and that compound causes reduction of this oxidizing agent.

Answer 2

OXIDISED SUBSTANCE MEANS AN ELEMENT GAIBED OXYGEN OR LOSES HYDROGN
OXIDISING AGENT MEANS WHICH THE ELEMENTS TO GET OXIDISED BY LOSING OXYGEN FROM ANOTHER ELEMENT.
EX:- Mg + Cuo ---> Mgo + Cu
here Mg is OXIDISED
Cu is OXIDISING Agent