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.

Give reason : Carbonate and Sulphide ores are usually converted into oxides during the process of extraction.

Give reason a. Platinum, gold and silver are used to make jewellery. b. Metals like sodium and potassium are stored under oil.

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

Give reasons: a. Platinum, gold, and silver are used to make jewellery. b. Sodium, potassium, and lithium ar stored under oil. c. Aluminilum is a higly reactive metal, yet it is used to make utensils for cooking. d. Carbonate and sulphate ores are usually converted into oxides during metal extraction.

State one property of each of the following which makes them suitable for the followng: a. Copper and aluminium for making electric wires b. Gold, platinium and silver are used to make jewellery c. Copper to make hiot water tank d. Graphite in making electrodes e. Alloys for making bells and strings in musical instruments.

State reasons for the following: Sulphide ore of a metal is first converted to its oxide to extract the metal from it.

Give reasons for the following : (i) School bells are made up of metals. (ii) Electrical wires are made up of copper.