Tag: chemistry

Questions Related to chemistry

How would you confirm that a colourless liquid given to you is pure water?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. By tasting it

  2. By determining the boiling point of the liquid

  3. By its volume measurement

  4. All of the above is done to check the purity of water

Show answer
Correct Option: B
Explanation:

By determining the boiling point of the liquid and comparing it with a colourless liquid, we can confirm whether it is pure water or not

Diffusion technique of separation can be used for :

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Separation of oxygen from air

  2. Recovery of hydrogen in oil refinery

  3. Separation of methane in bio gas

  4. All of above

Show answer
Correct Option: D
Explanation:

Gas mixtures can be effectively separated by synthetic membranes made from polymers such as poly-amide or cellulose acetate, or from ceramic materials. It can be used for separation of nitrogen or oxygen from air. Helps in Recovery of hydrogen in oil refinery processes. Also used in Separation of methane from the other components of bio gas.

Which gas will diffuse more rapidly through porous component?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Lighter gases

  2. Heavier gases

  3. Weight does not matter

  4. Highly dense gases

Show answer
Correct Option: A
Explanation:

Lighter gases diffuse more rapidly through porous component.

Liquefaction of gases helps in :

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. storing a gas in a compact form

  2. transporting a gas easily

  3. both a and b

  4. none of above

Show answer
Correct Option: C
Explanation:

The most important advantage of liquefying gases is that they can then be stored and transported in much more compact form than in the gaseous state. Two kinds of liquefied gases are widely used commercially for this reason, liquefied natural gas (LNG) and liquefied petroleum gas (LPG).

State a method to separate liquid-liquid mixture having different boiling points.

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Evaporation

  2. Separating funnel

  3. Fractional distillation

  4. Distillation

Show answer
Correct Option: C
Explanation:

To separate a liquid-liquid mixture having different boiling points, fractional distillation can be used.

Which of the following is a method for separation of gases?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Diffusion

  2. Liquefaction

  3. Centrifugation

  4. Solubility in a Solvent

Show answer
Correct Option: A,B,D
Explanation:

A mixture of two gases can be separated by diffusion, liquefaction and solubility in a solvent.

 Gas separation in membranes occurs due to differences in ______of the species flowing through the membrane.

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Permeabilities

  2. Number of atoms

  3. Weight

  4. All of above

Show answer
Correct Option: A,C
Explanation:

Gas separation is an important unit operation employedwidely throughout the chemical industries. Gas separation in membranes occurs due to differences in permeabilities of the species flowing through the membrane.

A single container wherein the enrichment process takes place through gaseous diffusion is called

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Divider

  2. Diffuser

  3. Stalk

  4. Rotator

Show answer
Correct Option: B
Explanation:

In a box with a semi-permeable membrane containing a mixture of two gases, the lighter molecules will pass out of the container more rapidly than the heavier molecules. The gas leaving the container is somewhat enriched in the lighter molecules, while the residual gas is somewhat depleted. A single container wherein the enrichment process takes place through gaseous diffusion is called a diffuser.

Which of the following are the drawbacks of gaseous diffusion methods for separation of gases?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Making and maintaining a suitable barrier

  2. Large energy consumption

  3. Long equilibrium times

  4. All of above

Show answer
Correct Option: D
Explanation:

Gaseous diffusion is unlikely to be the preferred technology of a proliferator due to difficulties associated with making and maintaining a suitable barrier, large energy consumption, the requirement for procuring large quantities of specialized stage equipment, large in-process inventory requirements, and long equilibrium times.

In a box with a semi-permeable membrane containing a mixture of two gases

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. The heavier molecules will pass out of the container more rapidly than the lighter molecules

  2. The lighter molecules will pass out of the container more rapidly than the heavier molecules

  3. Both heavier and lighter pass out of the container at equal rates

  4. Both a and c

Show answer
Correct Option: B
Explanation:

In a box with a semi-permeable membrane containing a mixture of two gases, the lighter molecules will pass out of the container more rapidly than the heavier molecules. The gas leaving the container is somewhat enriched in the lighter molecules, while the residual gas is somewhat depleted.