Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them? 

Why should the metal sulphides and carbonated ores be converted to metal oxides in the process of extraction of the metal from them?

A sulphide ore is converted into metal oxide by the process of:

A sulphide ore is converted into metal oxide by the process of:

Give Reason: a. Prior to reduction of the metal, sulphides and metal carbonates must be converted into metal oxides. b. for extracting some metals, displacement reactions are used instead of carbon to obtain metals from their oxides.

Give reason for the following: Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.

(i) Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals. (ii) Ionic compounds have generally high melting points. (iii) Hydrogen is not a metal but is has been assigned a place in the reactivity series of metals. (iv) The galvanised iron article is protected against rusting even if the zinc layer is broken.

Give reasons a. Platinum, gold and silver are used to make jewellery. b. Carbonate and sulphide ores are usually converted into oxides during the process of extraction. c. School bells are made up of metals.