Match the item given in column I and column II
No
Column I
Column II
(i)
Protective colloid
(a)
FeCl3+NaOH
(ii)
Liquid -liquid colloid
(b)
Lyophillic Colloids
(iii)
Positively charged colloid
(c)
Emulsion
(iv)
Negatively charged colloid
(d)
FeCl3+hot water
Match the item given in column I and column II
| No | Column I | Column II | |
| (i) |
Protective colloid |
(a) | FeCl3+NaOH |
| (ii) |
Liquid -liquid colloid |
(b) | Lyophillic Colloids |
| (iii) |
Positively charged colloid |
(c) | Emulsion |
| (iv) |
Negatively charged colloid |
(d) | FeCl3+hot water |
(i)→(b)
Lyophilic colloids are colloidal solutions in which dispersed phase has great affinity for dispersion medium. These solutions are quite stable and are reversible in nature. E.g. Sols of gum, gelatine, starch, proteins and certain polymers in organic solvents. They have a property of protecting the lyophobic colloids by forming a layer around them when lyophilic sol is added to lyophobic sol. Thus, they protect the colloid.
(ii)→(c)
An emulsion is a special type of mixture made by combining two liquids that normally don't mix (immiscible). It is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. This process of turning a liquid mixture into an emulsion is called emulsification.
(iii)→(d)
Charge on the colloidal particles is due to the preferential adsorption of either positive or negative ions on their surface. When FeCl3 is added to water it will prepare a Fe(OH)3 sol where Fe3+
ions are present in excess in dispersion medium and are common to lattice of sol. So, it gets preferentially adsorbed on sol and gives the sol overall positive charge.
(iv)→(a)
Charge on the colloidal particles is due to the preferential adsorption of either positive or negative ions on their surface. Due to the preferentIal adsorption of OH− ions, a negatively charged sol is obtained when FeCl3 is treated with NaOH. When FeCl3 is added in NaOH, the dispersion medium is excess with OH− ion hence it gets preferentially adsorbed to the sol giving overall negative charge.
Lyophilic colloids are colloidal solutions in which dispersed phase has great affinity for dispersion medium. These solutions are quite stable and are reversible in nature. E.g. Sols of gum, gelatine, starch, proteins and certain polymers in organic solvents. They have a property of protecting the lyophobic colloids by forming a layer around them when lyophilic sol is added to lyophobic sol. Thus, they protect the colloid.
(ii)→(c)
An emulsion is a special type of mixture made by combining two liquids that normally don't mix (immiscible). It is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. This process of turning a liquid mixture into an emulsion is called emulsification.
(iii)→(d)
Charge on the colloidal particles is due to the preferential adsorption of either positive or negative ions on their surface. When FeCl3 is added to water it will prepare a Fe(OH)3 sol where Fe3+
ions are present in excess in dispersion medium and are common to lattice of sol. So, it gets preferentially adsorbed on sol and gives the sol overall positive charge.
(iv)→(a)
Charge on the colloidal particles is due to the preferential adsorption of either positive or negative ions on their surface. Due to the preferentIal adsorption of OH− ions, a negatively charged sol is obtained when FeCl3 is treated with NaOH. When FeCl3 is added in NaOH, the dispersion medium is excess with OH− ion hence it gets preferentially adsorbed to the sol giving overall negative charge.
