Class XII

Which of the following chemical is used as a depressant in separating ZnS from PbS in froth floatation process?
  1. NaCN
  2. NaCl
  3. ZnSO2
  4. BaCl2
In blast furnace, the highest temperature is in
  1. Fusion zone
  2. Slag zone
  3. Combustion zone
  4. Reduction zone
The second most abundant metal on earth’s crust is
  1. Copper
  2. Aluminium
  3. Iron
  4. Zinc
Calamine is an ore of
  1. Lead
  2. Magnesium
  3. Calcium
  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
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