# 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 - T$∆$S

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

Difficulty Level:

• 62%
• 22%
• 11%
• 7%
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