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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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AAKASH SERIES-PRINCIPLES OF METALLURGY-PROBLEMS
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  2. Out of coke and carbonmonoxide, which is a better reducing agent for i...

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

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