Which of the following statement is not correct? from Chemistry

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 Multiple Choice QuestionsMultiple Choice Questions

171.

Cow milk, an example of natural emulsion, is stabilised by

  • fat

  • water

  • casein

  • Mg2+ ions


172.

Gold number is associated with

  • amount of gold

  • protective colloids

  • purple of cassius

  • electrophoresis


173.

Which one of the following forms micelles in aqueous solution above certain concentration?

  • Urea

  • Dodecyl trimethyl ammonium chloride

  • Pyridinium chloride

  • Glucose


174.

Migration of colloidal particles towards the oppositely charged electrode is called:

  • Electrosmosis

  • Electrophoresis

  • Coagulation

  • Electrodispersion


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175.

The variation of adsorption of N, on charcoal with pressure at different constant temperature can be represented by :

The correct increasing order of temperature
T1 , T2 and T3 is :

  • T1 < T2 < T3

  • T2 < T3 < T1

  • T3 < T2 < T1

  • T2 < T1 < T3


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176.

Which of the following statement is not correct?

  • Adsorption energy for chemical adsorption is generally greater than that of physical adsorption

  • Physical adsorption is due to van der Waal forces

  • Physical adsorption decreases at high temperature and low pressure

  • Physical adsorption is irreversible


D.

Physical adsorption is irreversible

Among all the statements, statement d is incorrect. Physical adsorption is due to van der Waal's forces which are weak forces, hence this type of adsorption is reversible and not irreversible. 


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177.

Solvent loving colloids are known as

  • hydrophobic

  • lyophilic

  • hydrophilic

  • none of these


178.

Freundlich adsorption isotherm gives a straight line on plotting:

  • xm vs p

  • log xm vs p

  • log xm vs log p

  • xm vs 1p


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179.

Arsenic sulphide sol is prepared by passing H2S through arsenic oxide solution. The charge developed on the particles is due to adsorption of :

  • H+

  • S2-

  • OH-

  • O2-


180.

Which one of the following colloidal solution is positive sol?

  • Gelatin in strongly acidic solution

  • Smoke

  • Dlay soil

  • Blood


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