Civil Engineering - Building Materials - Discussion

Discussion Forum : Building Materials - Section 6 (Q.No. 3)
Pick up the correct statement from the following:
Roasting is not necessary if iron ore is an oxide
Impurities float on the molten iron as slag
The slag contains lime about 45%
The molten iron is made to run, in a long channel formed in sand called 'sow'
All the above.
Answer: Option
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