In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

Given below are two statements :

Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.

Statement II : Silicon forms both electron rich and electron deficient hydrides.

In the light of the above statements, choose the most appropriate answer from the options given below :

The major component of which of the following ore is sulphide based mineral?

The reaction representing the Mond process for metal refining is _________.