Which of the following is the second major component of cement ?
Correct answer: B. SiO2
- A. Al2O3
- B. SiO2
- C. CaO
- D. Fe2O3
Explanation
Cement contains the most CaO, while SiO2 is generally the second-largest oxide by mass. Al2O3 and Fe2O3 are present in smaller proportions.
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