Which of the following is not a part of the layer of the products after the smelting process for the extraction of lead?

Which of the following is not a part of the layer of the products after the smelting process for the extraction of lead? Correct Answer Sulphur dioxide gas

After the smelting process the product contains four layers which include slag, copper matte, speiss and lead. The gases such as Sulphur dioxide gas are released from the top of the blast furnace.
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