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प्रश्न
A colloid is formed by adding \[\ce{FeCl3}\] in excess of hot water. What will happen if excess sodium chloride is added to this colloid?
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उत्तर
\[\ce{FeCl3}\] when added into hot water, it forms hydrated ferric oxide, which is a positively charged sol due to absorption of \[\ce{Fe^{3+}}\] ions. On adding \[\ce{NaCl}\] the negatively charged chloride ions neutralize the positive charge of the solution and coagulation of the sol takes place.
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संबंधित प्रश्न
Define the following with a suitable example, of each:
Multimolecular colloid
Write a note on Brownian motion.
Write a note on Types of emulsion.
Identify the CORRECT statement.
In coagulation of positively charged ferric hydroxide sol, the most and least effective ions are ____________ and ____________ respectively.
The order of coagulating power of following ions in the coagulation of a positive sol is:
i. \[\ce{PO^{3-}_4}\]
ii. \[\ce{SO^{2-}_4}\]
iii. \[\ce{[Fe(CN)6]^{4-}}\]
iv. \[\ce{NO^-_3}\]
Maximum coagulation power is in ____________.
Which of the following is NOT true for lyophilic colloids?
Mixing of two oppositely charged sols leads to ____________.
Which of the following can form colloidal sol with water?
Tyndall effect is useful ______.
The movement of colloidal particles towards respective electrode under electric field is called ______.
Which of the following ionic species has highest precipitating power?
A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ______.
What happens when electric field is applied to colloidal solution?
How do emulsifying agents stabilise the emulsion?
Which of the following is most powerful to coagulate the negative colloid?
Identify the colloidal molecule containing hydrophilic head and hydrophobic tail within it.
Identify the correct decreasing order of precipitation power of flocculating ion added, from following.
