JEE Advanced Model Paper 12 with solutions for online practice

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Question : 27 of 60
 
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Consider the following statements in the extraction of iron from haematite :
(I) CO is the main reducing agent
(II) Limestone is used to remove SiO2 as slag, CaSiO3
(III) Smelting process is carried out in blast fumance.
(IV) When air is used to oxidise the impurities, iron nitride is formed.
Pick the correct set of statement(s):
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