Which of the following statements is incorrect with respect to ph

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 Multiple Choice QuestionsMultiple Choice Questions

111.

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


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112.

Which of the following statements is incorrect with respect to physisorption?

  • The forces involved are van der Waals' forces

  • More easily liquefiable gases are adsorbed easily

  • Under high pressure it results into multimolecular layer on adsorbent surface

  • Hadsorption is low and positive


D.

Hadsorption is low and positive

For physical adsorption, H is negative. Thus, statement (d) is incorrect (due to attractive force between surface and adsorbed substance).


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113.

Sulphur sol contains

  • discrete S-atoms

  • discrete S molecules

  • large aggregates of S molecules

  • water dispersed in solid sulphur


114.

Which of the following colloids cannot be easily coagulated?

  • Lyophobic colloids

  • Multimolecular colloids

  • Macromolecular colloids

  • Irreversible colloids


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115.

The pressure of real gases is less than that of ideal gas because of

  • increases in the kinetic energy of the molecules

  • increases in the number of collisions

  • intermolecular attraction

  • finite size of particles


116.

An aerosol is a:

  • dispersion of a solid or liquid in a gas

  • dispersion of a solid in a liquid

  • dispersion of a liquid in a liquid

  • solid solution


117.

An aqueous solution of potash alum gives :

  • two types of ions

  • only one type of ion

  • four types of ions

  • three types of ions


118.

The formation of SO3 takes place according to the following reaction :

2SO2 + O2  2SO3H = -45.2 kcal

The formation of SO3 is favoured by:

  • increase in temperature

  • removal of oxygen

  • increase of volume

  • increase of pressure


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119.

The process which is responsible for the formation of delta at a place where rivers meets the sea is

  • Coagulation

  • Colloid formation

  • peptisation

  • emulsification


120.

A precipitate is changed to colloidal solution by the following process :

  • dialysis

  • ultrfiltation

  • peptization

  • electrophoresis


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