In the metallury of iron, the upper layer obtained in the bottom of blast furnace mainly contains:
A
CaSiO3
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B
Spongy iron
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C
Fe2O3
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D
FeSiO3
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Solution
The correct option is ACaSiO3 CaO+SiO2→CaSiO3 (slag) (Haematite ore contains silica as impurities). Slag being lighter and insoluble in molten metal floats over and thus, forms upper layer.