The material mixed before ore is subjected for smelting in the extraction of iron are

Limestone and silica

Coke and silica

Coke and limestone

Coke, limestone and silika

Before subjecting the ore for smelting to extract iron , we need a reducing agent and a flux , so that we can extract the pure metal .
So , Coke is used as a reducing agent and limestone is used as a flux for extracting iron from its ore through smelting .

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