Which one of the following characteristics is not correct for physical adsorption ?

Question

Which one of the following characteristics is not correct for physical adsorption ? (A) Adsorption on solids is reversible (B) Adsorption increases with increase in temperature (C) Adsorption is spontaneous (D) Both enthalpy and entropy of adsorption are negative

Tardigrade Admin · Accepted Answer

As temperature increases desorption increases. Adsorbent

+

Adsorbate

⇌

Adsorbed state

+ Δ E

Adsorption is exothermic process (forward direction), desorption is endothermic process (Backward direction)

According to Le-Chatelier's principle increase in temperature favours endothermic process.

Q. Which one of the following characteristics is not correct for physical adsorption ?

Adsorption on solids is reversible

Adsorption increases with increase in temperature

Adsorption is spontaneous

Both enthalpy and entropy of adsorption are negative

As temperature increases desorption increases. Adsorbent + Adsorbate ⇌ Adsorbed state +ΔE Adsorption is exothermic process (forward direction), desorption is endothermic process (Backward direction) According to Le-Chatelier's principle increase in temperature favours endothermic process.