Under what condition can Al reduce MgO?

Which of the following is the most suitable ore to undergo electrochemical process?

Which of the following is not refined by zone refining method?

Cast iron is the most important form of iron.

Roasting results in the formation of oxides. But why are oxide ores are subjected to roasting?

Which of the following is not a suitable ore for extracting iron?

In thermite process, what is the reducing agent used?

Which of the following are collectors used in the froth floatation process?