JEE, NEET, Foundation & CBSE (JEE Advanced 2018

Select correct statement regarding silver extraction / purification process.
  1. Lead is removed from argentiferous lead by Parkeís process.
  2. Zinc forms an alloy with lead, from which lead is separated by distillation.
  3. Zinc forms an alloy with silver, from which zinc is separated by distillation.
  4. When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.
During extraction of iron, which of the following act as a flux :
  1. Coke
  2. Silica
  3. Lime stone
  4. Calcium silicate
Haematite ore is concentrated by :
  1. Leaching
  2. Amalgamation
  3. Gravity separation method
  4. Froth floatation process
Which mineral has been named incorrectly
  1. Bauxite : Al₂O₃2H₂O
  2. Corundum : Al₂O₃
  3. Cryolite : 3NaF .AlF₃
  4. Feldspar : Be₃ Al₂Si₆O₁₈
Which one of the following reactions occurs during smelting in the reduction zone at lower temperature (in iron metallurgy) ?
  1. CO₂ + C → 2CO
  2. Fe₂O₃ + 3C → 2Fe + CO
  3. 3Fe₂O₃ + CO → 2Fe₃O₄ + CO₂
  4. CaO + SiO₂ → CaSiO₃ (slag)
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