Which of the following is incorrect for physisorption? from Chem

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 Multiple Choice QuestionsMultiple Choice Questions

191.

Blue colour of water in sea is due to :

  • refraction of blue light by impurities in sea water

  • refraction of blue sky by water

  • scattering of light by impurities

  • All of the above


192.

In aerosol, the dispersion medium is :

  • solid

  • liquid

  • gas

  • all of the above


193.

A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called

  • Tyndall effect

  • Brownian effect

  • Hardy- Schulze effect

  • none of these


194.

Hair cream is

  • gel

  • emulsion

  • solid sol

  • sol


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195.

According to Hardy schulze law, the flocculating power of an ion increases with

  • decreases in size

  • increase in size

  • decrease in charge

  • increase in charge


196.

Butter is an example of which type of colloid?

  • Solid in liquid

  • Liquid in solid

  • Liquid in liquid

  • Gas in liquid


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197.

Which of the following is incorrect for physisorption?

  • Reversible

  • Increases with increase in temperature.

  • Low heat of adsorption.

  • Increases with increase in surface area.


B.

Increases with increase in temperature.

Since, the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increase in temperature (Le-Chatelier's principle).


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198.

When a sulphur sol is evaporated sulphur is obtained .On mixing with water sulphur sol is not formed .The sol is :

  • lyophilic

  • reversible

  • hydrophobic

  • hydrophilic


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199.

An example for autocatalysis is :

  • oxidation of NO to NO2

  • oxidation of SO2 to SO3

  • decomposition of KClO3 to KCl and O2

  • oxidation of oxalic acid by acidified KMnO4


200.

Correct equation of Freundlich isotherm is

  • logxm= logk + 1nlog c

  • logxm = log c+1nlog k

  • logxm= log c +1k log c

  • log xm = logk + 1klog c


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