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JEE Main levelSingle correct optionDifficulty 2 of 3ph123

Which set of conditions is used to prepare from the elements?

  1. AXe : = 1 : 20, 873 K, 1 bar
  2. BXe : = 1 : 20, 573 K, 60-70 bar
  3. CXe : = 1 : 5, 873 K, 7 bar
  4. DExcess Xe, 673 K, 1 bar

Answer: B

Forming the highest fluoride needs a large excess of fluorine (1:20), a lower temperature (573 K) and a high pressure (60-70 bar). The 1:5 ratio at 873 K and 7 bar gives XeF4, and excess Xe at 673 K and 1 bar gives XeF2.
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