Where is the purest form of water available.

The purest form of coal is

The purest form of carbon is :

Purest form of iron is

Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron ?

Write the name of purest form of iron.

The vast quantity of water is available in-