When iron is heated with sulphur, iron sulphide is formed . Name the reaction
The process is synthesis.
The reaction you are referring to is called a "combination" or "synthesis" reaction. In this particular case, when iron is heated with sulphur, iron sulphide is formed. This can be represented by the following chemical equation:
Iron (Fe) + Sulphur (S) → Iron Sulphide (FeS)
To name this reaction, we use the generic term "combination" or "synthesis" since it involves the combination of two elements to form a compound. Specifically, the reaction you mentioned is an example of a metal reacting with a non-metal to form a compound.
Fe + S ==> FeS
synthesis