The impurity present in the ores is 

In the galvanization, the steel plate is protected by a coating of 

The percentage of carbon in wrought iron is 

The metallurgy of iron involves the manufacture of 

Bauxite is an ore of 

Roasting is generally used for

The corrosion resistance of steel is greatly improved by the addition of 

Haematite is an ore of iron which is chemically

The alloy used in aircraft parts are 

The process in which ore is heated in the absence of air is