Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points of discontinuity
The points where there is no further flow of metal
The points where no further change occurs
Constant for all metals

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Engineering Materials
Smelting is the process of

All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water
Reducing the ore with carbon in the presence of a flux
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns

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