Engineering Materials
The unit cells

Have the same orientation and their similar faces are parallel
All of these
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

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Engineering Materials
Smelting is the process of

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

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