In the presence of a catalyst, the heat evolved or absorbed durin

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 Multiple Choice QuestionsMultiple Choice Questions

161.

The Langmuir adsorption isotherm is deduced using  the assumption: 

  • the adsorption takes place in multilayers

  • The adsorption sites are equivalent in their ability to adsorb the particles

  • The adsorbed molecules interact with each other

  • The adsorbed molecules interact with each other


162.

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:

  • -log k

  • n

  • 1/n

  • 1/n

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163.

On which of the following properties does the coagulating power of an ion depend?

  • The magnitude of the charge on the ion alone

  • Size of the ion alone

  • The sign of the charge on the ion alone

  • Both magnitude and sign of the charge on the ion


164.

Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?

  • NH3

  • H2

  • CO2

  • O2


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165.

Which of the following is not applicable to the phenomenon of adsorption?

  • ΔH> 0

  • ΔG<0

  • ΔS<0

  • ΔH<0


166.

On the basis of Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure.

  • Reaches a constant limiting value

  • Goes on increasing with pressure

  • Goes on decreasing with pressure

  • First increasing and then decreasing with pressure


167.

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

  • xm = f(T) at constant p

  • p = f(T) at constant xm

  • xm = p × T

  • xm = f(p) at constant T


168.

Which of the following represents physical adsorption?


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169.

Which of the following curves is in accordance with Freundlich adsorption isotherm?


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170.

In the presence of a catalyst, the heat evolved or absorbed during the reaction

  • increases

  • decreases

  • remains unchanged

  • may increase or decrease


C.

remains unchanged

A catalyst does not alter the enthalpy change.


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