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Classify the following solids into amorp...

Classify the following solids into amorphous or crystalline solids.
Bakelite, Platinum , Camphor , Oxalic acid , Melamine formaldehyde, Alum , Neoprene, Sugar , Solid `CO_2` , Polythene.

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(i) Crystalline : Platinum, camphor, oxallic acid, alum, sugar, solid `CO_(2)`.
(ii) Amorphous : Bakelite, melamine, formaldehyde, neoprene, polythene.
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