Name the chief ores of `Cu, Fe and Al`. What are the methods employed for the concentration of their ores?

Name the methods used for the concentration of ores.

Name chief ore of iron.

Name the chief ores of tin, iron and aluminium. What methods are employed for the concentration or purification of their ores ?

Name the chief ores of tin, iron and aluminium. What methods are employed for the concentration or purification of their ores ?

The process of employed for the concentration of sulphide ore is

Name one chief ore of iron and aluminium. Name the methods used for the concentratation of these ores and their reduction.

Name one chief ore of iron and aluminium. Name the methods used for the concentratation of these ores .