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NEET2022ChemistryStates of MatterActual

Four gas cylinders containing He , N ₂, CO ₂ and NH ₃ gases separately are graudally cooled from a temperature of 500 ~K . Which gas will liquify first ? (Given T _ C in K - He : 5.3, ~N ₂: 126, CO ₂: 304.1 and . NH ₃: 405.5 )

Options

  1. AHe
  2. BN ₂
  3. CCO ₂
  4. DNH ₃

Correct answer

D. NH ₃

Step-by-step solution

Higher is the critical temperature, easier is the liquefaction of gas. The order of liquefaction of gases will be: NH ₃> CO ₂> N ₂> He Hence, among the given gases NH ₃ has the highest critical temperature. Therefore, it will be liquefied first.

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