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  • Help me solve this Which one of the following characteristics is associated with adsorption?

Which one of the following characteristics is associated with adsorption?

  • Option 1)

    \Delta G is negative but \Delta H and \Delta S are positive

  • Option 2)

    \Delta G , \Delta H \: and \: \Delta S are all negative

  • Option 3)

    \Delta G and \Delta H are negative but \Delta S is positive

  • Option 4)

    \Delta G and \Delta S are negative but \Delta H is positive

 

Answers (1)

As learnt in

Change in Q during adsorption -

\DeltaQ=\DeltaH - T\DeltaS

- wherein

\DeltaQ can be negative if \DeltaH is sufficiently high negative value as -T\DeltaS is positive. In an adsorption process which is spontaneous, a combination of these two factors make \DeltaG negative.

 

 As the molecule of the adsorbate are held on the surface of the solid assorbent, Entropy decreases i.e \Delta S= -Ve

As \Delta \theta =\Delta H-T\Delta S

For absorption to occur, \Delta \theta =-Ve and it is possible only when \Delta H =-Ve

 


Option 1)

\Delta G is negative but \Delta H and \Delta S are positive

This is incorrect option

Option 2)

\Delta G , \Delta H \: and \: \Delta S are all negative

This is correct option

Option 3)

\Delta G and \Delta H are negative but \Delta S is positive

This is incorrect option

Option 4)

\Delta G and \Delta S are negative but \Delta H is positive

This is incorrect option

Posted by

Vakul

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