Gaseous State Test

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Gaseous State Test - 8

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Question 1
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Statement-1: When the temperature of an ideal gas is increased from 37°C to 137°C keeping pressure constant, there will be an increase of 100 L in volume of the gas

Statement-2: At any constant pressure volume of gas a temperature on absolute scale.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Assertion in false. The increase in volume can be found by use of Charle's law. Reason is true.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.
Question 2
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Equal masses of an ideal gas and a real gas having same molecular mass are placed in separate containers of equal volumes and at the same temperature. Which of the following will be the true statements?

A
The real gas exerts lesser pressure than the ideal gas

B
Free space available for the molecules to move about in real gas is smaller than that in ideal gas

C
The real gas exerts greater pressure than the ideal gas

D
Molecules in ideal gas strike the walls with greater momentum than that in real gas

Solution

In a real gas the molecules going to strike the walls of the container are attracted towards interior owing to the intermolecular forces. As a result the molecules strike the walls with lesser momentum and exert lesser pressure than ideal gas.

Molecules in a real gas have finite size and occupy some volume. Thus the vacant (free) space available for the molecules to move about is somewhat decreased in comparison to ideal gas.

The correct answer is: Molecules in ideal gas strike the walls with greater momentum than that in real gas, The real gas exerts lesser pressure than the ideal gas, Free space available for the molecules to move about in real gas is smaller than that in ideal gas
Question 3
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The postulates of the kinetic molecular theory of gases include all those that follow except

A
no forces exist between molecules

B
molecules are in random motion

C
molecules are repelled by the walls of the container

D
molecules are point masses

Solution

According to the postulates of kinetic theory of gases, walls of the container act as rebounding medium; however it does not repel the gas molecules.

The correct answer is: molecules are repelled by the walls of the container
Question 4
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Directions For Questions

The extent of deviation of real gases from ideal behaviour, can be expressed in terms of compressibility factor (Z). Corrected ideal gas equation for real gases can be written as:

PV = nZRT

Where symbols have their usual meaning.

The reasons of deviation of real gases from ideal behaviour can be explained by kinetic theory of gases. For a real gas, compressibility factor (Z) have different values in different pressure zones, but its value is fixed at critical state.

...view full instructions

What will be the compressibility factor (Z) of a real gas at very high temperature and very low pressure?

A
<1

B
=1

C
>1

D
Slightly more than one

Solution

At very high temperature and very low pressure, a real gas behaves in ideal manner.
Question 5
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Directions For Questions

The extent of deviation of real gases from ideal behaviour, can be expressed in terms of compressibility factor (Z). Corrected ideal gas equation for real gases can be written as:

PV = nZRT

Where symbols have their usual meaning.

The reasons of deviation of real gases from ideal behaviour can be explained by kinetic theory of gases. For a real gas, compressibility factor (Z) have different values in different pressure zones, but its value is fixed at critical state.

...view full instructions

Choose the correct set of conditions of pressure and temperature at which a real gas shows maximum deviation from ideality.

A
10 atm, 273 K

B
5 atm, 273 K

C
10 atm, 356 K

D
5 atm, 356 K

Solution

Higher is the pressure and lower the temperature, greater will be the deviation from ideal behavior.