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Question
Four gases P, Q, R and S have almost the same values of 'b' but their 'a' values (a, b are Van der Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases, the most easily liquefiable one is
Options
P
Q
R
S
MCQ
Solution
P
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Derivation of Critical Constants from Van Der Waals Constant
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The table indicates the value of van der Waals constant ‘a’ in (dm3)2 atm. mol-2
| Gas | O2 | N2 | NH3 | CH4 |
| a | 1.360 | 1.390 | 4.170 | 2.253 |
The gas which can be most easily liquefied is
The units of Van der Waals constants 'b' and 'a' respectively
Derive the values of critical constants in terms of van der Waals constants.
