A) \[Si{{O}_{2}}\]
B) \[CaO\]
C) \[A{{l}_{2}}{{O}_{3}}\]
D) none of these
Correct Answer: B
Solution :
The chief component of cement is calcium oxide (CaO), which is found up to an extent of 70%. Besides it, it contains silica (20%), alumina (5%) and other metal oxides.
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