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Aftermath of Russian Revolution

Which of the ...

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Which of the following is a property of colloids?
(A) They are transparent
(B) Particles are not visible through naked eyes
(C) Particles settle down under the influence of gravity

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Q. Three mixtures A, B and C are obtained by stirring three different solids in water taken in separate beakers. When mixture A is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture A in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture B is allowed to stand for a considerable time, even then its particles do not settle down. Mixture B, however, scatters the beam of light just like mixture A. The particles of mixture C do not settle down on keeping and it also does not scatter a beam of light passing through it.

(a) What are the mixtures like A known as ?
(b) What are the mixtures like B known as ?
(c) What are the mixtures like C known as ?
(d) Name the phenomenon exhibited by A and B which occurs on passing a beam of light through them.
(e) Name one mixture each which is like (i) A (ii) B, and (iii) C.

Q. Which of the following is a property of suspensions?

(A) Suspension is transparent
(B) Suspended particles are visible through naked eye
(C) Suspension is homogeneous in nature

Which of the following statement are false regarding colloidal solution?

P. Colloidal solutions are homogeneous in nature.

Q. Colloidal particles pass through an ordinary filter paper.

R. Colloidal particles can be seen with naked eyes.

S. Colloidal particles do not settle under gravity.

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.

Q. if one word :the tendency of small particles to settle down under the influence of gravity.

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