Advertisements
Advertisements
प्रश्न
A colloidal sol is prepared by the given method in the figure. What is the charge on hydrated ferric oxide colloidal particles formed in the test tube? How is the sol represented?
Advertisements
उत्तर
Colloidal particles usually adsorb those ions which are in excess and are common to its own lattice. This preferential adsorption of a particular type of ions imparts a particular type of charge to colloidal particles.
When FeCl3 is added in NaOH, the constituent of the sol is Fe(OH)3 but the dispersion medium is having an excess of OH- ions. Hence, it gets preferentially adsorbed to the sol giving the overall negative charge. The sol is represented as Fe2O3.xH2O / OH-
APPEARS IN
संबंधित प्रश्न
What is the reason for the stability of colloidal sols?
Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.
Explain what is observed when an electric current is passed through a colloidal sol?
The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles ______.
What happens when a lyophilic sol is added to a lyophobic sol?
(i) Lyophobic sol is protected.
(ii) Lyophilic sol is protected.
(iii) Film of lyophilic sol is formed over lyophobic sol.
(iv) Film of lyophobic sol is formed over lyophilic sol.
Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.
Assertion: Colloidal solutions show colligative properties.
Reason: Colloidal particles are large in size.
Give reason for the following:
Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.
Gold number is associated with:-
The important factor in the stabilization of a colloidal solution is ______
