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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?

The brownian movement has been explained to be due to the unbalanced bombardment of the particles by the molecules of the dispersion medium.

When colloidal solutions are viewed under
a powerful ultra microscope, the colloidal particles appear to be in a state of continuous zig-zag motion all over the field of view. This motion was first observed by the British botanist, Robert Brown, and is known as Brownian movement.
This motion is independent of the nature of the colloid but depends on the size of the particles and viscosity of the solution - smaller the size and lesser the viscosity faster is the motion.

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

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190. Tyndall effect is due to?

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