Which of the following options are correct about the chemical composition test in cement?
1. If the ratio of percentage of alumina to that of iron oxide is 0.55, then it will be accepted.
2. Total loss on ignition should not be greater than 5 %.
3. The Sulphur content is calculated as SO3 and it should be less than 3.5%.
1
1 and 2
2
1, 2 and 3
3
2 and 3
4
Only 1