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NEET 2022
Exam
NEET
Year
2022
Subject
Chemistry
Chapter
States of Matter

NEET 2022 · Chemistry · States of Matter

Four gas cylinders containing He, N_2, CO_2 and NH_3 gases...

Four gas cylinders containing He,N2,CO2\mathrm{He}, \mathrm{N}_2, \mathrm{CO}_2 and NH3\mathrm{NH}_3 gases separately are graudally cooled from a temperature of 500 K500 \mathrm{~K}. Which gas will liquify first ? (Given TC\mathrm{T}_{\mathrm{C}} in K−He:5.3, N2:126,CO2:304.1\mathrm{K}-\mathrm{He}: 5.3, \mathrm{~N}_2: 126, \mathrm{CO}_2: 304.1 and NH3:405.5)\left.\mathrm{NH}_3: 405.5\right)

Options

  1. AHe\mathrm{He}
  2. BN2\mathrm{N}_2
  3. CCO2\mathrm{CO}_2
  4. DNH3\mathrm{NH}_3

Correct answer

D. NH3\mathrm{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: NH3>CO2>N2>He\mathrm{NH}_3>\mathrm{CO}_2>\mathrm{N}_2>\mathrm{He} Hence, among the given gases NH3\mathrm{NH}_3 has the highest critical temperature. Therefore, it will be liquefied first.
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