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 _________.

Given below are two statements :

Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it.

Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons.

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