1. List the principle means through which most of the d-block metals are extracted. Use Iron to explain each of these steps. 5 marks 2. During cobalt extraction, someone mentions that the material has high amounts of the Co-60 isotope. They want to separate the isotope using conventional extraction methods available for ore purification. Do you think this can be done? 3 marks 3. Select one of the following two elements (osmium or silver) and describe its extraction process. Make sure to mention the following items: what is the most likely ore, what are the basic steps, what is being oxidised and what is being reduced. Give chemical formula and equations where possible. 10 marks