Match List I with List II
List I                                                                List II
A. Physisorption                                       I. Single Layer Adsorption
B. Chemisorption                                      II. 20-40 kJ mol$$^{-1}$$
C. N$$_2$$(g) + 3H$$_2$$(g) $$\xrightarrow{Fe(s)}$$ 2NH$$_3$$(g)        III. Chromatography
D. Analytical Application or Adsorption   IV. Heterogeneous catalysis
Choose the correct answer from the options given below:

Matching the items:

A. Physisorption: Characterized by low enthalpy of adsorption, typically in the range of 20-40 kJ mol$$^{-1}$$. → II

B. Chemisorption: Forms a single layer (monolayer) on the surface because chemical bonds are formed between the adsorbate and specific surface sites. → I

C. N$$_2$$(g) + 3H$$_2$$(g) $$\xrightarrow{Fe(s)}$$ 2NH$$_3$$(g): This is the Haber process where iron acts as a solid catalyst with gaseous reactants — a classic example of heterogeneous catalysis. → IV

D. Analytical application of adsorption: Chromatography is the most important analytical application based on differential adsorption. → III

The correct matching is: A-II, B-I, C-IV, D-III.