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_________ allotropes of carbon do not have a definite geometric shape.

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Solution

Amorphous solids:
The solids in which the particles are not arranged in any specific order or the solids that lack the overall order of a crystal lattice are called amorphous solids.
Charcoal, soot, and lampblack are examples of allotropes of carbon which are amorphous solids.
These are microscopic forms of graphite.
They do not have a definite crystalline structure and no definite geometric shape.
Therefore, amorphous allotropes of carbon do not have a definite geometric shape.

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