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Surface Chemistry

Multiple Choice Questions

181. The Brownian motion is due to

Temperature fluctuation within the liquid phase
Attraction and repulsion between charges on the colloidal particles
Impact of molecules of the dispersion medium on the colloidal particles
Convection currents

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182. The sky looks blue due to

dispersion effect
Reflection
Transmission
Scattering

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183. The blue colour of water in the sea is due to

Refraction of the blue light by the impurities in sea water.
Reflection of blue sky by sea water.
Scattering of blue light by water molecules.
Absorption of other colours except blue colour by water molecules.

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184. According to Langmuir absorption isotherm, the amount of gas adsorbed at very high pressures

reaches a constant limiting value
goes on increasing with pressure
goes on decreasing with pressure
increases first and decreases later with pressure

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Short Answer Type

185. Define enthalpy of adsorption.

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186. State one difference betwen an emulsion and a sol.

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187. Out of NH₃ and N₂ which gas will be adsorbed more readily on the surface of charcoal and why?

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188. What is the cause of Brownian movement observed in colloidal solution?

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189. How can colloidal solution of sulphur in water be prepared?

Answer:

A colloidal sol of sulphur can be obtained by passing hydrogen sulphide into solution of sulphur dioxide in water or through a solution of an oxidising agent.

SO₂ + 2H₂S --------> 3S + 2H₂O

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190. Tyndall effect is due to?

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