Q83. State any two characteristic properties of a liquid.

Or

What are the main characteristics of a liquid?

Or

What are the characteristics of liquids?

 

Q84. Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?

Or

What is the importance of diffusion of gases in water in nature?

 

Q85. Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

 

Q86. A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering. Why?

 

Q87. What are the characteristics of the particles of matter?

 

Q88. Give two reasons to justify—

(a) water at room temperature is a liquid.

(b) an iron almirah is a solid at room temperature.

 

Q89. What happens when a crystal of potassium permanganate is dropped in a glass tumbler containing water? What conclusion can you draw?

 

Q90. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.

 

Q91. Among solids, liquids and gases, which one has: (a) maximum force of attraction between the particles? (b) minimum spaces in between particles? (c) maximum movement of particles?

 

Last modified: Thursday, 30 July 2020, 10:57 PM