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Change of State

Name the proc...

Question

Name the process associated with the following:
A drop of ink placed on the surface of water contained in a glass spreads throughout the water.

A

Diffusion.

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B

Sublimation.

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C

Absorption.

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D

Adsorption.

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Solution

The correct option is A Diffusion.
Ink diffuses in water because of random motion of water and ink molecules. Ink moves from areas of higher concentration to those of lower concentration and the rate of this movement is proportional to the diffusion coefficient of the ink in water.

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Q. Question 20
Name the process associated with the following
(a) Dry ice is kept at room temperature and at one atmospheric pressure.
(b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
(c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
(d) An acetone bottle is left open and the bottle becomes empty.
(e) Milk is churned to separate cream from it.
(f) Settling of sand when a mixture of sand and water is left undisturbed for some time.
(g) A fine beam of light entering through a small hole in a dark room. Illuminates the particles in its paths.

A drop of ink spreads evenly throughout the water. Why?

Name the process by which a drop of ink spreads in a beaker of water :

Q. John wants to understand the rate of diffusion of ink into water. So, he took four glasses A, B, C and D filled with water and each kept at a temperature of

10^{0} C

20^{0} C

30^{0} C

40^{0} C

respectively. Now John put 3 drop of blue ink slowly and carefully along the sides of all the glasses and left them undisturbed.
In which of the following glass, the number of days taken for the colour of the ink to spread evenly throughout the water will be minimum ?

Q. John wants to understand the rate of diffusion of ink into water. So, he took four glasses A, B, C and D filled with water and each kept at a temperature of

10^{0} C

20^{0} C

30^{0} C

40^{0} C

respectively. Now John put 3 drop of blue ink slowly and carefully along the sides of all the glasses and left them undisturbed.
In which of the following glass, the number of days taken for the colour of the ink to spread evenly throughout the water will be minimum ?

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