JEE, NEET, Foundation & CBSE (JEE Advanced 2018

Silica is added to roasted copper ores during extraction in order to remove
  1. Ferrous oxide
  2. Ferrous sulphide
  3. Cuprous sulphide
  4. Cuprous oxide
Egg shell is made up of a chemical. In which of the following ores this chemical is present ?
  1. Dolomite
  2. Calamine
  3. Lime stone
  4. Feldspar
Extraction of silver from Ag₂ S by the use of sodium cyanide is an example of :
  1. Roasting
  2. Smelting
  3. Hydrometallurgy
  4. Electrometallurgy
The beneficiation of the sulphide ores is usually done by
  1. Electrolysis
  2. Smelting process
  3. Froth flotation method
  4. Metal displacement method
Which mineral has been named incorrectly
  1. Bauxite : Al₂O₃2H₂O
  2. Corundum : Al₂O₃
  3. Cryolite : 3NaF .AlF₃
  4. Feldspar : Be₃ Al₂Si₆O₁₈
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