Question

Find out A from the given flowchart.

• A. $C{u}_{2}S$
• B. $CuFe{S}_2$
• C. $Fe{S}_2$
• D. $F{e}_3{O}_4$

Answer 1

The correct option is B $CuFe{S}_2$

The given flowchart represents extraction of Copper metal from its ore.

Copper pyrites $\left(CuFe{S}_2\right)$ contain only 2-3% of copper. The rest of ore contains iron as sulphide, silica, silicious materials, sulphur, arsenic etc as impurities. Froth flotation is carried out by xanthate and pine oil. The froth is collected and dried when concentrated ore is obtained which contains 25-30% of Cu.

Then smelting of the roasted ore is done in blast furnace is and when molten copper cools, it gives off the dissolved $S{O}_2$. The $S{O}_2$ gas escaping in the form of bubbles leaves the surface of the metal forming cavities which gives the metal a blistered appearance. This is why the metal thus obtained is called blister copper. Then finally by electrolysis we get pure copper.

Hence, A is $CuFe{S}_2$