While performing an activity, Alex puts a few teaspoons of flour into a glass of water. He stirs the mixture for a few minutes and after some time, he observes that the flour particles have settled down at the bottom.

Which of the following properties is true for the mixture formed by Alex:-
I) It always shows Tyndall effect.
II) The size of the constituent particles range from 1-1000 nm.
III) The constituent particles are visible by the naked eye.

Both I and II

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Both I and III

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Only I

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Only III

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Solution

The correct option is D Only III
The mixture of flour and water forms a suspension, since flour does not dissolve in water and settles down at the bottom.
Properties of a suspension:-
I) It may or may not show Tyndall effect. When the particles settle down, the suspension breaks and it does not scatter light any more.
II) The size of constituent particles is greater than 1000 nm.
III) The constituent particles are visible to the naked eye.

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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 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 ?

(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.

While performing an activity, Alex adds two teaspoons of flour to a glass of water. He observes that the flour particles settle down after some time. Which of the following properties is/are incorrect regarding the type of mixture formed by Alex?
I) It always shows Tyndall effect.
II) Particle size ranges from 1-1000 nm.
III) Particles are visible to the naked eye.

Q. While performing an activity, Rahul adds two teaspoons of charcoal to a glass of water. He observes that the charcoal particles settle down after some time. Which of the following properties is/are incorrect regarding the type of mixture formed by Rahul?
I) It always shows Tyndall effect.
II) Particle size is less than 1 nm.
III) Particles are visible to the naked eye.

Difference in size of particles is used to separate a mixture into its constituent components, by the process of:

Q. The information given below describes the properties of a certain type of mixture.

1. The particle size is around

10^{- 7}

m.
2. The constituent particles cannot be separated by filtration.
3. When a laser beam is passed through it, it clearly shows the path of the laser beam.

Which amongst the following shows the given properties?

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