Tag: chemistry

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Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Application of adsorption chromatography is/are _________.

  1. separation of relatively non polar, water insoluble compounds

  2. seperation of isomers

  3. purification of antibody fragments

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Adsorption column chromatography has been used for :

  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
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

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

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

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

  1. high pressure and high temperature

  2. low pressure and low temperature

  3. low pressure and high temperature

  4. high pressure and low temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

In which row are the substances correctly classified?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$\text{1.water is a compound made by combination of hydrogen and oxygen.}$
$\text{2.sulfur is an element.}$
$\text{3.Brass is mixture of elements sulphur and zinc.}$
Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

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

  1. Isotropic medium

  2. Anisotropic medium

  3. Optically denser medium

  4. Light medium
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of the following is not a property of compounds?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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