Which method of purification is represented by the following equation :
Ti (s) + 2I₂ (g) $$\buildrel {523K} \over \longrightarrow $$ TiI₄ (g) $$\buildrel {1700K} \over \longrightarrow $$ Ti (s) + 2I₂ (g)

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are

Which one of the following ores is best concentrated by froth – floatation method?