Important Questions of Surface Chemistry Chemistry | Zigya

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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


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.


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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