Q.1
What is the special name given to the process of extracting iron from iron ore in a blast furnace?
  • Melting
  • Smelting
  • Welting
  • Spelting
Q.2
Why can gold be found in the Earth's crust in its native state?
  • Gold is very rare
  • Gold is very unreactive
  • Gold is more reactive than lead
  • It came to Earth on meteorites
Q.3
What is the main impurity in iron from a blast furnace?
  • Carbon
  • Oxygen
  • Unreacted iron ore
  • All of the above
Q.4
During the process of smelting, what happens to copper ore?
  • It is oxidised
  • It is reduced
  • It is augmented
  • It is increased
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?
  • Filtration
  • Centrifuging
  • Electrolysis
  • Double reduction
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?
  • Using high powered lasers to blast the copper from the low grade ore
  • Using plants to absorb the copper compounds from the ores then burning the plants
  • Using the low grade ores with a mixture of chemicals that will dissolve the impurities
  • Using radioactive filters to get rid of the impurities
Q.7
Another idea is to dump scrap iron into solutions of copper salts. How would this work?
  • The iron would corrode which would push the copper out of solution
  • The iron would take any oxygen from the salts leaving behind pure copper
  • The iron would displace the copper from the salts
  • The iron would be reduced which would cause the copper to be deposited all around the inside of the reaction vessel
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?
  • Protozoa
  • Fish
  • Leeches
  • Bacteria and fungi
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?
  • SnO2 + 2C → 2CO2 + Sn
  • 2SnO2 + 2HCl → 2Sn + H2O + 2ClO
  • SnO2 + H2 → H2O + Sn
  • SnO2 + C → CO2 + Sn
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