CBSE  /  Class 12  /  Chemistry  /  General Principles and Processes of Isolation of Elements

  • 1. 
    Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding

  • carbon which reduces the impurities
  • water which dissolves the impurities
  • limestone which changes impurities into oxides and pass into slag
  • iron oxide which reacts with impurities by forming slag

  • 2. 
    In metallurgical process, aluminium acts as

  • an oxidising agent
  • a reducing agent
  • acidic flux
  • basic flux

  • 3. 
    Ellingham diagram represents change of

  • ΔG with temperature
  • ΔH with temperature
  • ΔG with pressure
  • (ΔG – TΔS) with temperature

  • 4. 
    During the extraction of haematite, limestone is added which acts as

  • flux
  • slag
  • reducing agent
  • gangue

  • 5. 
    In blast furnace iron oxide is reduced by

  • silica
  • carbon monoxide
  • carbon
  • lime stone

  • 6. 
    From the Ellingham graph between Gibb’s energy and temperature, out of C and CO with is a better reducing agent for ZnO?

  • Carbon
  • CO
  • Both of these
  • None of these

  • 7. 
    In a thermite process is used as reducing agent.

  • Zn
  • Al
  • Mn
  • Fe

  • 8. 
    Blister copper is

  • impure copper
  • obtained in self reduction process during bessermerisation
  • Both are correct
  • None is correct

  • 9. 
    Which of the following slags is produced during extraction of iron?

  • CaSiO
  • FeSiO
  • MgSiO
  • ZnSiO

  • 10. 
    Which of the following oxides cannot be reduced by hydrogen?

  • Ferric oxide
  • Aluminium oxide
  • Zinc oxide
  • Cupric oxide
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