Ncert Exercises & Solutions

Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron, and sulphur oxides of elements of which of the group(s) are present in the mixture?

1. Group 2

2. Groups 2, 13, and 14

3. Groups 2, and 13

4. Groups 2, and 14

Hint: Magnesium oxide, aluminum, and silicon oxide is present in cement

Cement is a product obtained by combining a material rich in lime.
CaO with other materials like clay which contains silica SiO₂ along with the oxides of aluminum, iron, and magnesium. The average composition of Portland cement is

CaO (50 - 60 %)

{SiO}_{2} (20 - 25 %)

{Al}_{2} O_{3} (5 - 10 %)

{Fe}_{2} O_{3} (1 - 2 %)

{SO}_{2} (1 - 2 %)

MgO (2 - 3 %)

Thus, it contains elements of group 2 (Ca), group 13 (Al) and group 14 (Si).

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