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प्रश्न
Explain Bredig’s arc method.
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उत्तर
- Colloidal sols can be prepared by electrical disintegration using Bredig’s arc method.
- This process involves vaporization as well as condensation.
- Colloidal sols of metals such as gold, silver, platinum can be prepared by this method.
- In this method, an electric arc is struck between electrodes of metal immersed in the dispersion medium.
- The intense heat produced vapourizes the metal which then condenses to form particles of colloidal sol.
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संबंधित प्रश्न
Define the following with a suitable example, of each:
Gel
Distinguish between lyophobic and lyophilic sols.
Draw labelled diagram Tyndall effect.
Draw labelled diagram of Bredig’s arc method.
Which one of the following methods is used to make platinum sol?
Identify the CORRECT statements from the following.
i. The colour of colloidal dispersion depends on size of colloidal particles.
ii. Tyndall effect is used to distinguish between colloidal dispersion and true solution.
iii. Eosin and congo red are examples of negatively charged sols.
Which of the following statements is CORRECT?
Tyndall effect is observed due to ____________.
Which of the following is multimqlecular colloid?
Tyndall effect is useful ______.
Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ solution?
What is collodion?
Why is \[\ce{Fe(OH)3}\] colloid positively charged, when prepared by adding \[\ce{FeCl3}\] to hot water?
Fog is a colloidal solution of ______.
The migration of dispersion medium under the influence of an electric potential is called ______.
In which of the following, the Tyndall effect is not observed?
Which of the following is most powerful to coagulate the negative colloid?
Which of the following electrolytes will be most effective in coagulating negative sol?
Blood may be purified by ______.
Van Arkel's method of purification of metals involves converting the metal to a ______.
Identify the colloidal molecule containing hydrophilic head and hydrophobic tail within it.
Starch is an example of which of the following type of colloid?
