1.

Cement, the important buildig material is a mixtureof oxides of several elements. Besidescalcium, iron and sulphur, oxides of elements of which of the group (s) are presentin the mixture

Answer»

group 2
group 2, 13 and 14
groups 2 and 13
groups 2 and 14

Solution :Cement is mainly a MIXTURE of calcium and aluminium silicates. Thus,it contains ELEMENTS of group 2 `(Ca)`group `13(AL)` and `Si(14)`.


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