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Amongst the following statements regarding adsorption, those that are valid are: (a) DH becomes less negative as adsorption proceeds. (b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas. (c) On adsorption, the residual force acting along the surface of the adsorbent increases. (d) With increase in temperature, the equilibrium concentration of adsorbate increases.

1. (1) (b) and (c)
2. (2) (a) and (b)
3. (3) (d) and (a)
4. (4) (c) and (d)

Correct answer: (2) (a) and (b)

Solution

(a) Adsorption enthalpy becomes less negative as the surface saturates - true. (b) NH3 (more easily liquefiable, higher critical temp) is adsorbed more than N2 - true. (c) residual surface forces DECREASE on adsorption, and (d) adsorption is exothermic so adsorbate amount DECREASES with temperature - both false. Answer: (a) and (b).

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