The purest form of iron is prepared by oxidising impurities from cast iron in a reverberatory furnace. Which iron ore is used to line the furnace? Explain by giving reaction.

The product obtained from blast furnace is called cast iron.

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron ?

Explain why: An optical pyrometer (for measuring high temperature) calibrated for an ideal black body radiation gives too low value for the temperature of a red hot iron piece in the open, but gives a correct value for the temperature when the same piece is in the furnace.

The main reactions occurring in blast furnace during extraction of iron from haematite are ___________ .

If the self-inductance of an iron ore inductor increases from 0.01 m H to 10mH on introducing the iron core into it, what is the relative permeability of the core used?

Aluminium displace iron from iron oxide(Fe_2O_3) giving iron and aluminium oxide. Which is more reactive aluminium or iron ?

(a) What is galvanisation ? (b) Give three methods to protect iron from rusting. (c) Discuss the factors responsible for rusting of iron or corrosion. (d) Name a chemical which is used for preventing rusting of iron.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?