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Chemistry Question on anomalous behaviour of beryllium

The average composition of portland cement is

A

CaO:40−50%CaO : 40 - 50\%, SiO2:30−40%SiO_2 : 30 - 40\% , Al2O3Al_2O_3, Fe2O3:10−20%Fe_2O_3 : 10 - 20\%

B

CaO:50−60%CaO : 50 - 60\%, SiO2:20−25%SiO_2 : 20 - 25\%, Al2O3:5−10%Al_2O_3 : 5 - 10\%, MgO:2−3%MgO : 2 - 3\%, Fe2O3:1−2%Fe_2O_3 : 1 - 2\% and SO3:1−2%SO_3 : 1 - 2\%

C

SiO2:40−50%SiO_2 : 40 - 50\%, CaO:30−40%CaO : 30 - 40\%, Al2O3:10−20%Al_2O_3 : 10 - 20\%

D

CaO:50%CaO : 50\%, SiO2:50%SiO_2 : 50\%

Answer

CaO:50−60%CaO : 50 - 60\%, SiO2:20−25%SiO_2 : 20 - 25\%, Al2O3:5−10%Al_2O_3 : 5 - 10\%, MgO:2−3%MgO : 2 - 3\%, Fe2O3:1−2%Fe_2O_3 : 1 - 2\% and SO3:1−2%SO_3 : 1 - 2\%

Explanation

Solution

Port land cement consists of raw materials mainly compounds of lime mixed with silica and alumina. CaO→50−6096CaO \rightarrow 50-6096 SiO2→20−2596SiO _{2} \rightarrow 20-2596 Al2O3→5−10%Al _{2} O _{3} \rightarrow 5-10 \% Fe2O3→1−29F e _{2} O _{3} \rightarrow 1-29 MgO→2−396MgO \rightarrow 2-396 SO3→1−2%SO _{3} \rightarrow 1-2 \% and few amount of oxides of iron, magnesium and sulphur.