Q79 / 180 · NEET 2014 · Chemistry

Which of the following statements is correct for the spontaneous adsorption of a gas?

A
$∆ S$ is negative and therefore, $∆ H$ should be highly positive
Correct answer
B
$∆ S$ is negative and therefore, $∆ H$ should be highly negative
C
$∆ S$ is positive and therefore, $∆ H$ should be negative
D
$∆ S$ is positive and therefore, $∆ H$ should also be highly positive

Solution

∆ G = ∆ H - T ∆ S

∆ S = - v e

for adsorption
So,

∆ H

must be

- v e

to make

∆ G = - v e

∆ G = ∆ H - T ∆ S

Hence, the correct answer is option: 'B'.