Tag: chemistry

Questions Related to chemistry

Application of adsorption in food industry is/are :

applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

  1. decolourisation of edible oils

  2. to remove bitter substances from fruit juices

  3. to remove salt from water

  4. to remove sugar contents

Show answer
Correct Option: A,B
Explanation:

Decolorization of edible oils and removing bitter substances can be obtained through adsorption.

The ion exchange resins helps in:

applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

  1. Removing moisture

  2. Controlling humidity

  3. Removing hardness of water

  4. All of the above

Show answer
Correct Option: C
Explanation:

Ion exchange resin method is used for removing hardness of water.

Application of adsorption chromatography is/are _________.

applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

  1. separation of relatively non polar, water insoluble compounds

  2. seperation of isomers

  3. purification of antibody fragments

  4. all of the above

Show answer
Correct Option: D
Explanation:

Adsorption chromatography has many applications. Generally, it is used for determining the concentration of a compound (or its purity), separating out a mixture into individual componentsseperation of isomers, and identifying what is in a mixture and seperate on the basis of solubility also. There are three main types of adsorption chromatography - column, thin layer, and gas-solid.

Adsorption column chromatography has been used for :

applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

  1. isolation and purification of vitamins and hormones

  2. examination of vegetable oil and pharmaceutical preparations

  3. used as indicator

  4. all of the above

Show answer
Correct Option: A,B
Explanation:

Column chromatography is used for isolation and purification of vitamins and hormones and for the examination of vegetable oil and pharmaceutical preparations.

Which of the following is most favourable for vander waals  adsorption?

applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

  1. high pressure and high temperature

  2. low pressure and low temperature

  3. low pressure and high temperature

  4. high pressure and low temperature

Show answer
Correct Option: D
Explanation:

Physisorption is Vanderwaals adsorption, it occurs at high pressure and low temperature conditions.

In which row are the substances correctly classified?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. element - brass; compound - sulfur; mixture - water

  2. element - sulfur; compound - brass; mixture - water

  3. element - sulfur; compound - water; mixture - brass

  4. element - water; compound - sulfur; mixture - brass

Show answer
Correct Option: C
Explanation:
$\text{1.water is a compound made by combination of hydrogen and oxygen.}$
$\text{2.sulfur is an element.}$
$\text{3.Brass is mixture of elements sulphur and zinc.}$

Which method separates a mixture of sugar and glass?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. dissolve, filter and evaporate

  2. distillation

  3. fractionally distill

  4. use chromatography

Show answer
Correct Option: B
Explanation:

$\text{Distillation is a way of seperation substances based on the difference in their boiling points}$

The medium having same chemical properties in all directions is called :

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Isotropic medium

  2. Anisotropic medium

  3. Optically denser medium

  4. Light medium

Show answer
Correct Option: A
Explanation:

Isotropic medium is the one in which permeability and permittivity are unifrom in all directions,

hence, it is having same chemical properties in all directions.

Which one of the following is neither an element nor a compound?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Air

  2. Glucose

  3. Gold

  4. Water

  5. Carbon

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Correct Option: A

Which of the following is not a property of compounds?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Components are present in a fixed proportions

  2. They are always homogeneous

  3. The components in compounds do not retain their original properties

  4. The components in compounds can be separated by physical means

Show answer
Correct Option: D
Explanation:

The components of compounds can be separated by chemical means. Rest all are properties of compounds.