1. Metal which
forms an amphoteric oxide?
Ans. Aluminium oxide.
2. An alloy
of copper and zinc.
Ans. Brass
3. A compound
which is added to lower the fusion temperature of an electrolytic bath in
extraction of aluminium.
Ans. Cryolite.
4. A metal
which does not react with cold water but reacts with steam.
Ans. Aluminium.
5. A common
ore of aluminium.
Ans. Bauxite.
