1.

Given below is an approximate composition of a substance: \[CaO\]              60-70% \[Si{{O}_{2}}\]                         20-25% \[A{{l}_{2}}{{O}_{3}}\]                       5-10% \[F{{e}_{2}}{{O}_{3}}\]                      2-3% The substance is

A. plaster of Paris
B. cement
C. marble stone
D. quartz
Answer» C. marble stone


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