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प्रश्न
Why does leather get hardened after tanning?
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उत्तर
Animal skin is colloidal, in nature and carries positive charge. Tannin is a negatively charged colloidal solution. When leather is soaked in tannin, mutual coagulation of the two takes place and leather gets hardened.
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संबंधित प्रश्न
Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
Explain what is observed when an electric current is passed through a colloidal sol?
Explain the term Tyndall effect.
What happens when an emulsion is centrifuged?
Answer the following question.
Why are medicines more effective in the colloidal state?
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 ______.
Which of the following statements are correct?
(i) Mixing two oppositely charged sols neutralises their charges and stabilises the colloid.
(ii) Presence of equal and similar charges on colloidal particles provides stability to the colloids.
(iii) Any amount of dispersed liquid can be added to emulsion without destabilising it.
(iv) Brownian movement stabilises sols.
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.
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?
(i) Reverse osmosis takes place.
(ii) Electroosmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
How does it become possible to cause artificial rain by spraying silver iodide on the clouds?
Give reason for the following:
Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.
Which of the following is used for removing change on colloidal solution?
Gold number is associated with:-
State the Hardy-Schulze rule.
What is electrophoresis?
Why a negatively charged sol is obtained when AgNO3 solution is added to KI solution?
Which of the following is a correct statement?
