Which of the following metals is present in the anode mud during electrolytic refining of copper?

Which one of the following metals is widely extracted by the electrolysis of its molten compound?

Which one of the following metals can be extracted using carbon as reducing agent?

Cinnabar is an ore of which one of the following?

Which one of the following is not a property of 'graphene'?

Which of the folowing is an iron ore ?