Class XII

In blast furnace, the highest temperature is in
  1. Fusion zone
  2. Slag zone
  3. Combustion zone
  4. Reduction zone
An ore has impurities which are lighter than the ore. The process used for the concentration of ore is
  1. Hydraulic washing
  2. Magnetic separation
  3. Leaching
  4. Froth floatation
The second most abundant metal on earth’s crust is
  1. Copper
  2. Aluminium
  3. Iron
  4. Zinc
Metal halides are found in lakes and seas because
  1. They are insoluble in water
  2. They are heavier than water
  3. They are soluble in water
  4. They are lighter than water
The reducing agent used in the blast furnace to reduce haematite to iron is
  1. Carbon monoxide
  2. Carbon dioxide
  3. Carbon
  4. Silica
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