1Which is the primary step of purifying metal? (Smelting, Roasting, Concentration, Grinding)
2Which of the following ores is oxidised by the roasting method? (Hematite, Siderite, Bauxite, Cuprite)
3In which process is smelting included? (Grinding, Refining, Oxidation, Reduction)
4Give reason: Ores are oxidised after concentration.
5Write the differences between roasting and calcination.
6Write the differences between oxidation and reduction.
7How is metallurgy a stepwise process? Explain.
8How are pure metals obtained from electro-refining? Explain it with an activity.
9What is gangue, and why must it be removed?
10Why can aluminium oxide not be reduced by carbon?
11What is slag, and where is it formed?
12An ore's particles are much heavier than the sand mixed with them. Which method would you use to concentrate it, and why?
13Why is distillation suitable for refining mercury?