1What is an ore?
2All ores are minerals, but all minerals are not ores. Explain.
3Name the ores of iron with their chemical formulas. Which one is the chief ore, and why?
4Write the names and formulas of the ores of aluminium. Which is the chief ore, and how much aluminium does it contain?
5Name four ores of copper with their formulas and state the main ore of copper.
6Name the ores of silver. Which is the chief ore of silver?
7Why is gold found in a pure state in nature? Where is it mainly found?
8Why must impurities be removed from an ore, and what does the method of removing them depend on?
9Malachite contains about 57.3% copper and chalcopyrite about 34.5%. Why is chalcopyrite still the main ore of copper?
10How is iron pyrite different from copper pyrite?
11Why are iron and aluminium always obtained from ores while gold is not?