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Metals

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  • The metals obtained after electro-refining are approximately
    95% pure
    99% pure
    90% pure
    80% pure
  • The process of crushing ores into small particles using machines is called
    Calcination
    Roasting
    Grinding
    Refining
  • Which process uses electrolysis to purify metals like copper silver and gold
    Electro-refining
    Distillation
    Grinding
    Roasting
  • Which of the following is converted into ZnO by roasting
    CaCO₃
    NaCl
    Fe₂O₃
    ZnS
  • Refining is done to
    Remove remaining impurities from metals
    Crush ores into powder
    Extract ores from the earth
    Convert ores into oxides
  • Which of the following is a mixture
    Air
    Sodium chloride (NaCl)
    Water (H₂O)
    Gold (Au)
  • Roasting converts sulphide ores into
    Alloys
    Carbonates
    Metals
    Oxides
  • The unwanted impurities in ores such as mud sand and rocks are called
    Gangue
    Mineral
    Alloy
    Slag
  • In electro-refining the impure metal is connected to the
    None of these
    Both terminals
    Anode
    Cathode
  • Which of the following is a pure substance made of only one type of atom
    Oxygen (O₂)
    Salt water
    Sand and iron filings
    Air
  • The process of heating ores with reducing agents beyond their melting points is called
    Smelting
    Roasting
    Refining
    Calcination
  • Calcination converts carbonate ores into
    Sulphides
    Alloys
    Slags
    Oxides
  • If one substance is magnetic and the other is not which separation method is used
    Calcination
    Magnetic separation
    Froth floatation
    Distillation
  • Which of the following is a compound
    Oxygen (O₂)
    Gold (Au)
    Sodium chloride (NaCl)
    Sand and iron filings
  • The process of removing impurities from ores to increase the percentage of metal is called
    Refining
    Calcination
    Reduction
    Concentration
  • In electro-refining the pure metal is connected to the
    Both terminals
    Cathode
    Anode
    Ground
  • The by-product formed when impurities combine during smelting is called
    Electrode
    Alloy
    Gangue
    Slag
  • Which refining method is used for metals with a low boiling point like mercury
    Smelting
    Distillation
    Electro-refining
    Calcination
  • Froth floatation is used when
    Both substances are magnetic
    Both substances have the same density
    The ore is soluble in water
    One substance is hydrophilic and the other hydrophobic
  • Which method is used if the ore and impurities differ in density
    Magnetic separation
    Froth floatation
    Hydraulic washing
    Roasting
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