Class XII

Which among the following is a chemical process?
  1. Leaching
  2. Magnetic separation
  3. Froth floatation
  4. Gravity separation
Metals which occur in native state in nature
  1. Are not very reactive
  2. Have low density
  3. Do not form compounds
  4. Are very reactive
Gravity separation technique is mainly applicable to
  1. Oxide ore
  2. Halide ore
  3. Carbonate ore
  4. Sulphide ore
The furnace which gives the highest temperature is
  1. Reverberatory furnace
  2. Electrical furnace
  3. Muffle furnace
  4. Blast furnace
Blister copper is about
  1. --------98% Cu------------------------------------------------------------------------ 98% Cu
  2. 90% Cu
  3. 60% Cu
  4. 30% Cu
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