Question

The noble gases can be separated by:

  • Electrolysis of their compounds
  • Fractional distillation of air
  • Adsorption and desorption by coconut charcoal
  • Sublimation

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Answer

To separate noble gases, adsorption and desorption by coconut charcoal is used. Let's break down how this process works:

  1. Preparation: A gaseous mixture that is free of oxygen and nitrogen is prepared.

  2. Adsorption Process:

    • Coconut charcoal is used due to its ability to adsorb gases.
    • Each noble gas is adsorbed at different temperatures.
    • Adsorption property increases with the atomic weight of the noble gases. That means:
      • Helium, having the least atomic weight, is adsorbed the least.
      • Xenon, having the highest atomic weight, is adsorbed the most.
  3. Factors Affecting Adsorption:

    • Atomic Weight: The higher the atomic weight of the gas, the stronger its adsorption on the charcoal.
    • Temperature: Different gases are adsorbed at different temperatures, influenced by their molecular weights.
  4. Desorption Process:

    • The gases can then be desorbed by changing the temperature, leading to their separation.

Thus, through the method of adsorption and desorption by coconut charcoal, noble gases can be effectively separated. This method leverages the variations in adsorption strength based on atomic weights and temperature conditions.

Final Answer: Adsorption and desorption by coconut charcoal


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