NEET Chemistry Surface Chemistry Questions Solved

NEET - 2016

Which one of the following characteristics is associated with adsorption?

(a) G, H and S all are negative

(b) G and H are negative but S is positive

(c) G and S are negative but H is positive

(d) G is negative but H and S are positive

(a) Adsorption is a spontaneous process that occurs with release in energy and decrease. In the randomness (i.e. entropy) of the adsorbed substance.

For a spontaneous process, G must be negative.

G = H - TS

As the process is exothermic and randomness of molecule (entropy) decreases hence, both H and S will be negative as well.

Difficulty Level:

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