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The plots of the extent of adsorption versus pressure at different temperature are as follows;

The correct order of increasing temperature for curves I, II, III, IV are

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Important Questions on Surface Chemistry
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Adsorption of the gas increases with:

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( is the mass of the gas adsorbed per gram of adsorbent)

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(a) 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 the increase in temperature, the equilibrium concentration of adsorbate increases.

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Given:
On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?

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