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Q: When heated to 205 ºC, pure gypsum loses its luster and its specific gravity is increased from _____ to _____ due to the loss of water of crystallization.
  • A. 2.3 ; 2.95
  • B. 1.5 ; 2.95
  • C. 2.3 ; 2.7
  • D. 2.3 ; 3
Correct Answer: Option A - Gypsum– Gypsum is a non-hydraulic binder occurring naturally as a soft crystalline rock or sand. Pure gypsum is a white in colour and so soft that it can be scratched by a finger nail. • When heated to 2050C pure gypsum loses its luster and its specific gravity is increased from 2.3 to 2.95 due to the loss of water of crystallization.
A. Gypsum– Gypsum is a non-hydraulic binder occurring naturally as a soft crystalline rock or sand. Pure gypsum is a white in colour and so soft that it can be scratched by a finger nail. • When heated to 2050C pure gypsum loses its luster and its specific gravity is increased from 2.3 to 2.95 due to the loss of water of crystallization.

Explanations:

Gypsum– Gypsum is a non-hydraulic binder occurring naturally as a soft crystalline rock or sand. Pure gypsum is a white in colour and so soft that it can be scratched by a finger nail. • When heated to 2050C pure gypsum loses its luster and its specific gravity is increased from 2.3 to 2.95 due to the loss of water of crystallization.