Question

Choose the INCORRECT statement among the following?

• A. Blister copper has blistered appearance due to evalution of $C{O}_2$
• B. Copper matte contains $C{u}_{2}S$ and $FeS$
• C. Wrought iron is purest form of commercial iron
• D. Pig iron contains about $4\%$ carbon

Answer 1

The correct option is A Blister copper has blistered appearance due to evalution of $C{O}_2$

(a) The solidified copper that has blistered appearance due to the evolution of $S{O}_2$ and so it is called blister copper.
(b) In metallurgy process of copper, the ore is heated in a reverberatory furnace after mixing with silica. In the furnace, iron oxide ‘slags of’ as iron silicate and copper is produced in the form of copper matteCopper matte contains $C{u}_{2}S$ and $FeS$.
(c) Wrought iron or malleable iron is the purest form of commercial iron and is prepared from cast iron by oxidising impurities in a reverberatory furnace lined with haematite.
(d) The iron obtained from Blast furnace contains about $4\%$ carbon and many impurities in smaller amount. This is known as pig iron and cast into variety of shapes.