Class XII

Liquation method is used for the metals which have
  1. Low melting points
  2. High melting points
  3. Low boiling points
  4. High boiling points
Extraction process of Bauxite is known as
  1. Cynanide process
  2. Van – Arkel – de Boer process
  3. Mond’s process
  4. Hall – Heroult process
In the froth floatation process for the concentration of ore, the particles float because
  1. They are light
  2. They are insoluble
  3. They reacts with oil
  4. Their surface is wetted with oil
Cinnabar is an ore of
  1. Zinc
  2. Mercury
  3. Copper
  4. Lead
Which of the following metals cannot be extracted by smelting process?
  1. Zn
  2. Pb
  3. Fe
  4. Al
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