Q.1
One reason for researching new methods to extract copper from low grade ores is...
  • more copper is being found
  • less copper is being used
  • low grade ores contain a large amount of copper
  • the price of copper has risen significantly
Q.2
Why is aluminium extracted using electrolysis?
  • Aluminium is more reactive than carbon
  • Electrolysis is a cheap process
  • Aluminium is less reactive than carbon
  • Very little energy is required for electrolysis
Q.3
Which of the following shows a balanced chemical equation for the reduction of iron ore in the blast furnace?
  • Fe2O3 +3CO → 2Fe +3CO2
  • Fe2O3 +2CO → Fe +3CO2
  • Fe2O3 +CO → Fe +CO2
  • Fe2O3 +3CO → 2Fe +CO2
Q.4
Metals can be extracted from low grade ores using plants. This process is called...
  • Photomining
  • Phytomining
  • Bioleaching
  • Electrolysis
Q.5
Choose the correct order of reactivity for the five metals.
  • Mg, Al, Zn, Fe, Sn
  • Al, Zn, Fe, Sn, Mg
  • Al, Mg, Fe, Zn, Sn
  • Sn, Zn, Fe, Al, Mg
Q.6
Ores are the starting point for extracting metals because...
  • ores contain enough metal to make it economically viable
  • it is easy to extract metals from ores
  • there are large amounts of metal in ores
  • ores are found in many locations
Q.7
Which of these metals is found as itself rather than in a compound?
  • Sodium
  • Iron
  • Aluminium
  • Gold
Q.8
If aluminium cans are not recycled, they can affect the environment by...
  • producing poisonous gases
  • causing acid rain
  • filling up landfill sites
  • corroding rapidly in rivers and lakes
Q.9
Which of the following is a disadvantage of extracting copper by bioleaching?
  • Bioleaching uses low grade ores
  • Bioleaching is slower
  • Bioleaching is more economical
  • Bioleaching uses less energy
Q.10
Copper can be obtained from its ore by displacement using scrap iron because...
  • copper is more reactive than iron
  • iron is more reactive than copper
  • scrap iron is cheaper than copper
  • copper reacts with iron
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