Question

The molten metal obtained from Bessemer converter in the metallurgy of copper is called blister copper. It ______.

Options

• is 100% pure copper.

• is about 50% pure copper.

• consists of blisters due to the liberation of dissolved air.

• consists of blisters due to the liberation of dissolved SO₂.

Answer 1

The molten metal obtained from Bessemer converter in the metallurgy of copper is called blister copper. It consists of blisters due to the liberation of dissolved SO₂.

Explanation:

Blister copper is the metal obtained after converting molten copper matte in a Bessemer converter. It contains about 98% pure copper. During the process, sulphur impurities are oxidised, and sulphur dioxide (SO₂) gas is formed. As this gas escapes from the molten copper, it forms blister-like bubbles on the surface of the solidifying metal. These blisters give the metal its name, blister copper.