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# The blast furnace used for smelting is provided with double cup and cone arrangement to

$(a)\;\text{feed the charge from top without letting any gas to escape.} \\(b)\;\text{enhance the proper mixing of charge.} \\(c)\;\text{ allow enough air to mix with charge for complete combustion} \\ (d)\; \text{To avoid moisture. }$

The CO should not go out without reducing ore of a particular metal.
Hence a is the correct answer.