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

Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Sulphide ores are converted into oxides by

(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.

Sulphide ore is converted to oxide form by using the process

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

How is mercury extracted from its sulphide ore? Write the balanced chemical equations involved in the process. Why are carbonate or sulphide ores converted to oxides during the process of extraction? Is magnesium oxide an ionic compound or a covalent compound? Give reasons to support your answer.