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Question

Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?


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Solution

Ore

  • Ore is a mineral deposit in the Earth's crust that contains one or more valuable minerals.
  • Copper, gold, and iron, which are crucial to commerce and trade, are found in the most valuable ore deposits.

Extraction of ore A

  • On heating ore A gives carbon dioxide CO2 gas.
  • Hence it is a carbonate ore.

Steps for extraction of ore A

  1. Calcination
  • Calcination is the term used to describe the process of strongly heating the ore to form an oxide.
  • The reaction is as follows:

ACO3AO+CO2

2. Reduction

  • The metal oxide is reduced with coke to produce metal.
  • The reaction is as follows:

AO+CA+CO

Extraction of ore B

  • On heating, ore B gives sulfur dioxide SO2 gas.
  • Hence it is a sulfide ore.

Steps for extraction of ore B

1. Roasting

  • Roasting is a metallurgical process that involves heating ore below its melting point in the presence of excess air.
  • The reaction is as follows:

2BS+3O22BO+2SO2

2. Reduction

  • The metal oxide is reduced to metal by coke.
  • The reaction is as follows:

BO+CB+CO


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