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What is the role of Limestone in the ext...

What is the role of Limestone in the extraction of Iron from its oxide `Fe_(2)O_(3)` ?

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In the extraction of iron ,a basic flux limestone is used .Limestone decomposes to form CaO which reacts with silica gangue present in the iron ore is acidic in nature to form calcium silicate (slag).
`CaCotoCaO+CO_(2)`
`underset("flux")(CaO)+SiO_(2)tounderset("slag")(CaSiO_(3))`
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