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Q.

Calcium silicate (slag) formed in the slag formation zone in extraction of iron from haematite ore:

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a

does not dissolve in molten iron

b

is used in cement industry and as building material

c

prevents the re-oxidation of molten iron

d

being lighter floats on the molten iron

answer is A, B, C, D.

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Detailed Solution

When iron is extracted from haematite ore, calcium silicate (slag) is created in the slag formation zone. Being lighter than liquid iron, the calcium silicate floats on the molten iron and prevents it from reoxidizing.

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