Engineering Materials
A material is said to be allotropic, if it has

Atoms distributed in random pattern
Any one of the above
Fixed structure at all temperatures
Different crystal structures at different temperatures

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

The converter must be titled to remove the contents of the converter
The brown smoke does not occur during the operation of a Bessemer converter
Silicon and manganese has burnt and carbon has started oxidizing
Air is burning out silicon and manganese

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