ICSE Class 10: Redox Reactions Videos | Types of Chemical Reactions

The colour of Cu filing changes to black on heating. This change in colour occurs because on heating Cu reacts with oxygen present in the air to form CuO. 

A combustion reaction is also called an exothermic reaction 

Addition of hydrogen causes the reduction of N₂ in the above reaction. 

Redox reactions are reactions in which oxidation and reduction take place simultaneously. 

Carbon is the oxidising agent in the reaction.