Process of Obtaining Different Gases from Air

Q.

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

Among the three gases, which gas is collected at last?

1. Nitrogen

2. Oxygen

3. Argon

4. Cannot be determined

Q.

How will you separate the components of air?

Q. Oxygen from air is separated by fractional distillation.

1. True
2. False

Q.

How can we obtain different gases from air?

Q.

What substances need to be removed before air is liquefied during fractional distillation?

1. Dust and spores

2. $C{O}_2$ and water vapour

3. $C{O}_2$ and bacteria

4. $C{O}_2$ and $O_3$

Q.

The boiling point of liquid argon is :

$\left(a\right)-{196}^{\circ }C\left(b\right)-{183}^{\circ }C\left(c\right)-{186}^{\circ }C\left(d\right)-{193}^{\circ }C$

Q. How is oxygen prepared from air?

Q.

The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :

(a) nitrogen, oxygen, argon (b) nitrogen, argon, oxygen

(c) argon, oxygen, nitrogen (d) oxygen, argon, nitrogen

Q.

Difference between fractional distillation and distillation

Q.

What name is given to the space when air is removed from the container.

Q.

Fractional Distillation is the separation of a mixture into its component parts or fractions. This is the process of separation of chemical compounds by their boiling point, the mixture is heated to a temperature at which one or more fractions (component parts) will vaporize. Generally the component parts boil at less than 25°C from each other under a pressure of one atmosphere. It is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases like Helium, Krypton, Nitrogen dioxide etc.

Consider three gases Oxygen, Nitrogen and Argon whose boiling points are -183, -196, -186 degree celsius, that are to be separated from air using Fractional Distillation.

The air is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

State True of False:

Statement: The temperature is low at the base of the Fractional Distillation.

1. True

2. False

Q. Which of the following gases are separated by fractional distillation?

1. Oxygen
2. Carbon dioxide
3. Argon
4. Nitrogen

Q.

In the fractional distillation of air, which component of air gets separated as dry ice?

1. Hydrogen

2. Carbon dioxide

3. Nitrogen

4. Oxygen

Q. Gases in air are converted into liquids by the process called ______ .

1. evaporation
2. liquefaction
3. distillation
4. sublimation

Q.

Fractional distillation is used to separate the components of air.

1. True
2. False

Q.

Gases can be obtained from air by the process of

1. Fractional distillation

2. Condensation

3. Crystallization

4. Evaporation

Q.

Explain the Separation process.

Q.

The process through which a solid directly changes to a gaseous state without passing through a liquid state is called as _______ .

1. Distillation

2. Centrifugation

3. Sublimation

4. Fractional distillation

Q.

Which separation techniques will you apply for the separation of the followingalso explain briefly.

a. Benzene from water

b. Alcohol from water

c. Sugar from glass pieces

D. Iodine from charcoal

e. Sulphur from carbon

f. Dye from ink

Q.

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

Among the three gases, which gas is collected at last?

1. Oxygen

2. Nitrogen

3. Argon

4. Cannot be determined

Q.

In case of the fractional distillation of air, which of the following are correct?

1. Liquid oxygen is obtained at $-{185}^{o}C$.

2. Liquid nitrogen is obtained at $-{198}^{o}C$.

3. Liquid nitrogen is obtained at $-{185}^{o}C$.

4. Gaseous oxygen is obtained at $-{198}^{o}C$.

Q.

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

__ is the gas collected in least volume.

Q.

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

__ is the gas collected in least volume.

Q.

Give reasons for the following statement.

The composition of a mixture is variable.

Q. Which of the following gas is collected at the top in fractional distillation?

1. Oxygen
2. Argon
3. Nitrogen
4. Hydrogen

Q. Assertion :Benzene (boiling point $353K$) and methanol (boiling point $338K$) are separated by simple distillation. Reason: Fractional distillation is used to separate two liquids from their mixture when their boiling points differ by $25K$ or less.

1. Assertion and reason both are correct statements and reason is the correct explanation for assertion.
2. Assertion and reason both are correct statements but the reason is not the correct explanation for assertion.
3. Assertion is wrong statement but reason is correct statement.
4. Assertion and reason both are wrong statements

Q. The liquid air in fractional distillation method separates depending on :

1. melting point
2. density
3. volume
4. boiling point

Q.

Explain the method to obtain gases from air.

Q.

suggest techniques used to separate liquids

Q. Assertion :Essential oils are volatile and are insoluble in $H_{2}O$. Reason: Essential oils are purified by steam distillation.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect