Aluminium is extracted from alumina Al2O3 by electrolysis of a molten mixture of:
1.
2.
3.
4.
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:
1. Copper(l) sulphide (Cu2S)
2. Sulphur dioxide (SO2)
3. Iron Sulphide (FeS)
4. Carbon monoxide (CO)
Which of the following elements is present as an impurity to the maximum extent in the pig Iron?
1. Carbon
2. Silicon
3. Phosphorus
4. Manganese
A pair of metals that can be purified by van Arkel method is:
1. Zr and Ti
2. Ag and Au
3. Ni and Fe
4. Ga and In