In the manufacture of iron,limestone is added to the blast furnace. The calcium ion ends up in the form of:

Which of the following is an acidic flux?

Which metal is extracted by the electrolytic reduction method?

Formation of metallic copper from the sulphide ore in the commercial thermo-metallurgical process essentially involves which one of the following reactions as the major reaction?

Lead is mainly extracted by

When alumina is heated with carbon in a nitrogen atmosphere,the products are