In Langmuir's model of adsorption of a gas on a solid surface:

  • A
    the mass of gas striking a given area of surface is proportional to the pressure of the gas
  • B
    the mass of gas striking a given area of surface is independent of the pressure of the gas
  • C
    the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
  • D
    the adsorption at a single site on the surface may involve multiple molecules at the same time

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Which graph represents the amount of chemisorption of a gas with temperature under constant pressure?

Arrange the gases $H_2, CH_4, CO_2,$ and $NH_3$ in the order of their volume adsorbed on $1 \ g$ of charcoal at $288 \ K$.

Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

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Assertion : $NH_3$ is absorbed more readily over activated charcoal than $CO_2$.
Reason : $NH_3$ is non-polar.

If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent at pressure $p,$ Freundlich adsorption isotherm gives a straight line on plotting

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