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Both coke and lime stone are used in sme...

Both coke and lime stone are used in smelting of iron ore. Why? 

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Coke acts as a fuel and reducing agent, by forming carbon monoxide. Lime stone decomposes to give quick lime. Lime acts as a flux and removes acidic impurities as slag.
`CaO+ SiO_(2) to CaSiO_(3)`
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