engineering recuitment ISRO Scientist Civil Mock Test Construction Materials and Management Cement

Four main oxides present in ordinary Portland cement are: CaO, Al₂O₃, SiO₂ and Fe₂O₃. Identify the correct ascending order of their proportions in a typical composition of OPC

1

Al₂O₃, Fe₂O₃, CaO, SiO₂

2

Al₂O₃, CaO, Fe₂O₃, SiO₂

3

Fe₂O₃, Al₂O₃, SiO₂, CaO

4

Fe₂O₃, SiO₂, Al₂O₃, CaO

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