Brownian Motion

Q.

A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, $\mathrm{HCHO}$ and water. The component which ensures the stability of the ink sample is?

1. $\mathrm{HCHO}$

2. Water

3. Eosin dye

4. Egg white

Q. 40.For given hypothetical elementary parallel reaction, A ----> 2B (k1) ----->2C (k2) where k1/k2 = 0.5 Initially only 2 moles of A are present.The total no. of moles of A, B and C at the end of 75% reaction are (a) 2 (b) 3 (c) 4 (d) 3.5

Q. Diff between colloids and crystalloids

Q.

When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the _____ of light by milk and the phenomenon is called ______. This indicates that milk is a _______ solution.

Q. Colloidal sols shows brownian movement . Does true solution also shows ? If yes or no then"why"?

Q. 46. The value of ebullioscopic constant for water is 0.521 ℃/molal for 1000 g water. Find the value of ebullioscopic constant for 500 g water.

Q.

Rohit mixed starch with water, boiled the mixture well and stirred it. He observed that:

1. starch floats on the surface of water.

2. starch settles down at the bottom.

3. starch forms a translucent mixture.

4. starch forms a transparent mixture.

Q. on adding a non volatile solute to a solvent, tge vapour pressure of aolvent decreases and becomes z\ast(vapour pressure of solvent) where z is a)mole fraction of solvent b)mole freaction of solutre c)molality d)mole fraction of solut

Q.

What is Brownian motion? Who observed it first?

Q. 66. The vapour pressure of pure liquid solvent is 0.80 atm. When a non volatile substance B is added to solvent its vapour pressure reduces to 0.60 atm mole fraction of component B in solution is

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.

Will a sugar solution in water show Tyndall effect?

1. True
2. False

Q.

Give two examples of drift velocity.

Q. what is soddy-fajan and russel or group displacement law.

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. Assertion :Colloidal solutions are stable but colloidal particles do not settle down. Reason: Brownian movement counters the force of gravity actively on colloidal particles.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

What is scattering of light by mist on head light of vehicles called?

1. Peptization

2. Brownian movement

3. Electrophoresis

4. Tyndal effect

Q. The vapour pressure of a solvent decreased by 10mm of hg when a non volatile solute was added to the solvent . The mole fraction of solute in solution is 0.2 what would be the mole fraction of solvent if decrease in vapour pressure 20mm of hg

Q.

Define the Tyndall effect.

Q. The vapour pressure of a solvent decreased by 10mm of mercury when a non-volatile solute was added to the solvent the mole fraction of the solute in the solution is 0.2 what should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20mm of mercury

Q. What are the characteristics of the following colloids ? Give one example of each.
(i) Multimolecular colloids
(ii) Lyophobic sols
(iii) Emulsions

Q.

Give reasons for the following

Colloidal solutions exhibit Brownian motion

Q. What causes Brownian movement in colloidal solution?

Q. The density of gold is 19 g/cm3. If 1.9 x 104 g of goldis dispersed in one litre of water to give a sol havingspherical gold particles of radius 10 nm, then the numberof gold particles per mm3 of the sol will be

Q.

Name the scientist, who first studied the jiggling of pollen grains in water under a microscope.

Q.

1. True
2. False

Q.

What is the reason behind the stability of a colloidal solution?

Q. What is the concept of diffusion and Brownian motion?

Q. The Brownian motion is due to:

1. Temperature fluctuation within the liquid phase
2. Impact of the molecules of the dispersion medium on the colloidal particles
3. Convectional current
4. Attraction and repulsion between charges on the colloidal particles

Q. What is the cause of Brownian movement in colloids?