Q.1.
What is the special name given to the process of extracting iron from iron ore in a blast furnace?
Q.2.
Why can gold be found in the Earth's crust in its native state?
Q.3.
What is the main impurity in iron from a blast furnace?
Q.4.
During the process of smelting, what happens to copper ore?
Q.5.
Carbon can be used to remove the oxygen from copper oxide to leave the copper. This contains impurities including carbon. How is this copper purified?
Q.6.
It is said that by the middle of the 21 century economical copper ores will have been used up. New ways of extracting copper from low-grade ores are being researched. One of these is called phytomining. What does phytomining involve?
Q.7.
Another idea is to dump scrap iron into solutions of copper salts. How would this work?
Q.8.
Bioleaching is yet another idea for getting metals that are less reactive than aluminium from very low grade ores and wastes. What organisms are used in this process?
Q.9.
The most common ore of tin is cassiterite, a form of tin oxide with the formula SnO . Which of the following is a balanced equation showing the extraction of tin from this ore?