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, 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, 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) A is a type of mixture known as:

(b) B is a type of mixture known as:

(c) C is a type of mixture known as:

(d) Name the phenomenon exhibited by A and B which
occurs on passing a beam of light through them.
[4 Marks]

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Solution

(a) A is a type of mixture known as suspension. The
particles of a suspension settle down when left
undisturbed for sometime and also scatter a
beam of light passing through it.
[1 Mark]

(b) B is a type of mixture known as a colloid. The
particles of a colloid do not settle down but scatter
a beam of light passing though it.
[1 Mark]

(c) C is a type of mixture known as a solution. The
particles of a solution neither settle down nor
scatter the beam of light passing though it.
[1 Mark]

(d) The phenomenon responsible for observation
made is known as Tyndall effect. It is the
phenomenon by which path of a beam of light
becomes visible due to scattering of light.
[1 Mark]

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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 sometime, 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 the 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 with the beam of light.

e. Name one mixture each which is like A, B and C.

Q. Mark the correct statement(s).
(I) The solute particles settle down when suspension is left undisturbed.
(II) Particles of a suspension scatter a beam of light passing through it and makes its path visible.
(III) Suspension is a homogeneous mixture.

Tthe solid particles that settle at the bottom of the beaker in a heterogeneous mixture of solid-liquid is known as

Q. The particles of a colloidal solution do not settle down with time and form a stable mixture.

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