During smelting an additional substance is added which combines with impurities to from a fusible product which is known as

Impurities present in then ore react to form a fusible substance known as.

Copper is extracted form its ore by :

A mixture containing sulphide of copper and iron is called :

In electro refining of copper some gold is deposited at 

Gravity separation process is used for the concentration of

Which element has the largest abundance in the earth’s crust?

Which one of the following is malachite ore of copper?

Argentite is a mineral of 

Cinnabar is