Calcium is extracted by the electrolysis of

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?

Which of the following metals is extracted by the amalgamation process?

Cryolite is .........

Which is the main reducing agent for extraction in a blast furnace?

Limestone is present in the blast furnace production of iron in order to
$(I)$ provide a source of $CaO$
$(II)$ remove some impurities
$(III)$ supply $CO_2$