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CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 2 Mark Questions With Solution 2021

Published on: 27/05/2021

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Questions:

Generic 2

5 x 2 = 10

Compressibility factor, Z of a gas is given as \(Z=\frac { pV }{ nRT } \) What is the value of Z an ideal gas?

Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosity. Also, give the reason for the assigned order in one line.
Water, hexane (CH₃CH₂CH₂CH₂CH₂CH₃), glycerine (CH₂OHCH(OH)CH₂OH)

Explain the effect of increasing temperature of a liquid on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased?

Why does sharp glass edge become smooth on heating it up to melting point in a flame? Explain which property of liquids is responsible for this phenomenon?

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Answers Key:

Generic 2

5 x 2 = 10

For ideal gas,compressibility factor, Z = 1

The energy which arises due to motion of atoms or molecules in a body is known as thermal energy.It is a measure of average kinetic energy of the particles.It increases with increases with increase in temperature.

The increasing order of viscosity is
hexane < water < glycerine
Reason. In hexane, there are only London forces whereas in water and glycerin, there is hydrogen bonding which is stronger in case of glycerine (because of the presence of three __ OH groups) than that in water.

As the temperature of a liquid increases, kinetic energy of the molecules increases which can overcome intermolecular forces. So, the liquid can flow more easily, this results in decrease in viscosity of the liquid.

Sharp glass edges are heated to make them smooth. Because on heating glass melts and the surface of the liquid tends to take shape at the edges which has minimum surface area.