Brownian Motion

Q. Which of the following does not affect the Brownian movement:

1. Nature of colloid
2. Size of the particles
3. None of the above
4. Viscosity of the solution

Q. The zig-zag motion (erratic motion) of particles in colloid was observed by :

1. Tyndall

2. Thomas Graham

3. Zsigmondy

4. Robert brown

Q. Colloidal particles dispersed in a liquid medium undergo a random, zigzag motion called the Brownian movement. The reason for this phenomenon is:

1. Extensive and uniform solvation
2. None of the above
3. Surface tension
4. Unbalanced forces caused by the bombardment of atoms of dispersion medium that surround the dispersed phase particles

Q. Which one of the following statements is correct?

1. Sols of metal sulphides are lyophilic
2. Brownian movement is more pronounced for smaller particles than for bigger ones
3. Catalyst does not alter energy of activation
4. Schulze-Hardy law states, the bigger is the size of the ion, the greater is its coagulating power

Q. The correct statement(s) about surface properties is(are)

1. Adsorption is accompanied by decrease in enthalpy and decrease in entropy of the system
2. The critical temperatures of ethane and nitrogen are 563 K and 126 K, respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature
3. Cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium
4. Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution

Q. Identify the correct statement from the following.

1. Brownian movement is more pronounced for smaller particles than the bigger ones
2. Sols of metal sulphides are lyophilic
3. Hardy-Schulze law states that larger the size of the coagulation ion greater is its coagulation power
4. A lyophilic sol is most stable at isoelectric point

Q. The zig-zag random motion of colloidal particles in a dispersion medium is called:

1. brownian motion
2. tyndall effect
3. electrophoresis
4. electro-osmosis

Q. Which of the following are correct statements?

1. Hardy-schulz rule is related to caogulation
2. Brownian moment and Tyndall effect are the characteristic of colloids
3. In gel, the liquid is dispersed in liquid
4. Lower the gold number, more is the protective power of lyophilic sols

Q. Which one of the following statements is correct?

1. None of these
2. Brownian movement is more pronounced for smaller particles than for bigger ones
3. Sols of metal sulphides are lyophilic
4. Schulze-Hardy law states, the bigger the size of the ion, the greater is its coagulating power

Q. Beaker $A$ has sugar mixed with water and Beaker $B$ has starch dissolved in water.
i) Which solution will scatter light?
ii) In which beaker does the Brownian movement take place?
iii) Name the type of solution that beaker $A$ and beaker $B$ contain.
iv) Which of the two solutions is homogeneous?
v) Identify the beaker that has particles of size $10\stackrel{\circ }{A}$ to $2000\stackrel{\circ }{A}$