Amongst the following statements regarding adsorption, those that are valid are :
          (a) $ΔH$ 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.

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(b) and (c)

(a) and (b)

(d) and (a)

answer is B.

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Detailed Solution

During adsorption, after some time equilibrium is reached. Hence $ΔH$ becomes less negative.

${NH}_{3}$ has more $T_{C}$ , hence more adsorbed than $N_{2}$ .
Due to adsorption, residual forces decrease.

As T increases, $(\frac{x}{m})$ decreases.

$∴$ (a) & (b) are true.

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