(a) Name the methods by which concentrated ore is converted to metallic oxide

(b) State three objectives achieved during the roasting of ores.

Name:

(a) the processes involved in (i) dressing of the ores (ii) refining of the ores.

(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

What do you observe when hydrogen is passed over heated copper oxide?

Compare roasting and calcination.