Which among the following statement is correct in case of chemical composition of cement.
(i) The ratio of alumina to iron oxide should be more than 0.66
(ii) Lime saturation factor should not be more than 0.66
(iii) Amount of magnesia should not be more than 6 percent.
1
(i) and (iii)
2
(ii) and (iii)
3
(i) and (ii)
4
All of these