The purest form of iron is prepared by oxidising the impurities present in cast iron in a reverberatory furnace. What type of iron is used for lining inside the furnace ? Explain with equation.

Wrought iron is the purest form of iron. Write the reactions involved in the preparation of wrought iron from cast iron. How can the impurities like S, Si and P be removed from cast iron?

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron. How is pig iron different from cast iron?

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag-

The composition of a sample of wustite is Fe_(0.93)O_1 . What percentage of the iron is present in the form of Fe(III)?

Why blast furnace is not used in the extraction of zinc? Why Iron can't be extracted form iron pyrities?

Explain why-(a) A green layeris formed on the surface of copper which is left exposed in moist air for a long period. (b) blue colour of the copper sulphate solution is discharged slowly when an iron rod is dipped in it. (c) Galvanised irono is not used as a fondstuff container.

A piece of iron of mass 100 gm is kept inside a furnace for a long time and then put in a calorimeter of water equivalent 10 gm containing 240 gm of water at 20°C. The mixture attains an equilibrium temp. of 60^@C . Find the temperature of the furnace. Specific heat capacity of iron = 470 J kg^-1"^@C^-1 .

{:("Column - I","Column - II"),("(A) Blister copper","(i) Aluminium"),("(B) Blast furnace","(ii) "2Cu_(2)O+Cu_(2)S rarr 6Cu+SO_(2)),("(C) Reverberatory furnace","(iii) Iron"),("(D) Hall-Heroult process","(iv) "FeO+SiO_(2)rarr FeSiO_(3)),(,"(v) "2Cu_(2)S+3O_(2)rarr 2Cu_(2)O+2SO_(2)):}