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JEE Main201912 Jan 2019Morning ShiftChemistryStates of MatterActual

Given: On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?

Options

  1. ACH 4
  2. BCO 2
  3. CSO 2
  4. DH 2

Correct answer

D. H 2

Step-by-step solution

Method 1 : The extent of adsorption is directly proportional to the critical temperature. As H 2 has the lowest critical temperature, it will have the lowest extent of adsorption. Method 2 : The value of adsorption is dependent on the intermolecular forces of attraction. Among the given options, H 2 will have the weakest van der Waal's force (London Dispersion), in which only 2 electrons are involved. Hence, as a force of attraction is the weakest for H 2 , it will have the lowest adsorption value.

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