Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

States of Matter

Short Answer Type

151.

What do you mean by state of dynamic equilibrium?

110 Views

152.

Separate portions of chloroform and water at the same temperature are poured on your hands. The chloroform feels colder. Account for this in terms of attractive forces.

125 Views

153.

Why is cooling caused in evaporation?

119 Views

154.

Explain why alcohol produces a greater cooling effect on skin that water does.

131 Views

155.

Why does the temperature of the boiling liquid remain constant?

114 Views

Long Answer Type

156.

Explain briefly the boiling point of a liquid. What is the effect of change in external pressure on the boiling point?

138 Views

Short Answer Type

157.

Will water boil at a higher temperature at sea level or on the top of a mountain ?

140 Views

158. How will you differentiate between evaporation and boiling?

124 Views

159.
What do you understand by vapour pressure of solids?

Solids also evaporate and thereby exhibit a vapour pressure. The molecules of a crystalline solid operate with respect to their equilibrium position and are in a position to collide constantly with the nearest neighbours which lead to a distribution of kinetic energies. A small fraction of molecules at the surface of the solid possesses enough kinetic energy to break away from the surface. As a result, the free molecules enter the vapour state. The process in which solid is directly converted to its vapour state is called sublimation. This accounts for the vapour pressure of solids.

96 Views