During Roasting …………….. ore is converted into …………….. ore.

The reducing agent in thermite process is ……………..

When cinnabar is heated in air it first converted into …………….. and then reduced to ……………

The process of obtaining the pure metal from impure metal is called ……………..

The …………….. method is suitable for purification of low boiling metals.

The …………….. method is suitable for purification of low melting metals.

Blister copper is purified by using……………..

Tarnishing of silver is due to formation of ……………..

Corrosion of iron occurs in the presence of ……………. and…………..

The chemical name of rust ……………