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Among the following gases, which one shows the highest enthalpy of physisorption?

1. C2H6
2. Ne
3. H2O
4. H2

Correct answer: C2H6

Solution

Enthalpy of physisorption increases with the ease of liquefaction (higher critical temperature) of the gas. Among the choices C2H6 is most easily liquefied, so it shows the highest enthalpy of physisorption.

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