Class XII

Which among the following statement is correct?
  1. metals are extracted from mineral
  2. all ores are minerals
  3. all minerals are ore
  4. a mineral cannot be an ore
Conversion of ore to oxide is generally carried out by the process of
  1. Both (a) and (b)
  2. Smelting
  3. Calcinations
  4. Roasting
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
Which process is usually applied for separating gangue from sulphide ores?
  1. Leaching
  2. Froth floatation
  3. Gravity separation
  4. Magnetic separation
Cassiterite is the chief ore of
  1. Sn
  2. Fe
  3. Cu
  4. Al
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