The brass is an alloy of

• gold and copper

• silver and zinc

• copper and zinc

• copper and aluminium

72.

Cupellation method is used for the extraction of

• Cu

• Ag

• Na

• Al

Heating pyrites to remove sulphur is called

• smelting

• calcination

• liquation

• roasting

In the metallurgy of which of the following cupellation process is used?

• Copper 

• Silver

• Iron

• Aluminium

Cryolite is used in the electrolytic extraction of aluminium

• to obtained more alumimium

• to decompose bauxite

• to protect anodes

• as a reducing agents

The important ore of lead is

• chalcopyrite

• haematite

• galena

• cast iron

The iron obtained from blast furnace is

• pig iron

• wrought iron

• soft iron

• cast iron

Parke's process is used for the extraction of

• iron

• sodium

• silver

• zinc

The common method of extraction of metals from oxide ores is

• reduction with carbon

• reduction with hydrogen

• reduction with aluminium

• electrolytic method

Malachite is the ore of which metal?

• Fe

• Cu

• Zn

• Hg