Which of the following statements is true about the adsorption?

Options

A. `lArr H lt 0 and lArr S lt 0`
B. `lArr H gt 0 and lArr S lt 0`
C. `lArr H lt 0 and lArr S gt 0`
D. `lArr H = 0 and lArr S lt 0`

Answer

A

Explanation

In adsorption the adsorbed particles show strong force of attraction with the surface on which they adsorb and therefore their randomness also decreases.
`therefore Delta H lt 0 and Delta S lt 0`
Hence, (a) is the correct answer.