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?
(i) group 2
(ii) groups 2, 13 and 14
(iii) groups 2 and 13
(iv) groups 2 and 14
Option (ii) groups 2, 13 and 14 is the answer