Features of physisorption: effect of temperature, enthalpy, entropy and forces

1. A.
   O₂ gas deposited on tungsten
2. B.
   H₂ gas deposited on nickel
3. C.
   N₂ gas deposited on iron
4. D.
   All gases deposited on charcoal

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1. A.
   Critical temperature of gas
2. B.
   Surface area of adsorbent
3. C.
   Temperature of process
4. D.
   Pressure of gas

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1. A.
   Increases with increase in temperature
2. B.
   Decreases with increase in surface area
3. C.
   Decreases with increase in the strength of Van der Waals forces
4. D.
   Decreases with increase in temperature

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1. A.
   $\Delta S$ is negative and, therefore $\Delta H$ should be highly positive
2. B.
   $\Delta S$ is negative and therefore, $\Delta H$ should be highly negative.
3. C.
   $\Delta S$ is positive and therefore, $\Delta H$ should be negative.
4. D.
   $\Delta S$ is positive and therefore, $\Delta H$ should also be highly positive.

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1. A.
   Coulombic force
2. B.
   Electrostatic force
3. C.
   London force of dispersion
4. D.
   Hydrogen bonding

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1. A.
   It is reversible
2. B.
   It is multimolecular.
3. C.
   $\Delta H < 0$
4. D.
   $\Delta S > 0$

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