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प्रश्न
Write Hardy-Sulze rules.
Write a note on Hardy–Schulze rule.
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उत्तर
- Generally, the greater the valency of the flocculating ion added, the greater is its power to cause precipitation. This is known as the Hardy–Schulze rule.
- In the coagulation of negative sol, the flocculating power follows the following order:
Al3+ > Ba2+ > Na+ - Similarly, in the coagulation of positive sol, the flocculating power is in the following order:
\[\ce{[Fe(CN)_6]^{4-} > PO_4^{3-} > SO_4^{2-} > Cl^-}\]
संबंधित प्रश्न
Comment on the statement that “colloid is not a substance but a state of substance”.
Distinguish between lyophobic and lyophilic sols.
What happens when a beam of light is passed through a colloidal sol.
Explain the term emulsion and types of emulsions.
Draw labelled diagram of Soap micelle.
Which one of the following methods is used to make platinum sol?
Identify the CORRECT statement.
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?
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. \[\ce{NO^-_3}\]
Which of the following is NOT true for lyophilic colloids?
Tyndall effect is observed due to ____________.
Smoke is an example of ____________.
Which of the following can form colloidal sol with water?
Tyndall effect is useful ______.
Which of the following ionic species has highest precipitating power?
In which of the following sols there is low affinity between dispersed phase and dispersion medium?
Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ solution?
Which of the following substances will precipitate the negatively charged emulsions?
(i) \[\ce{KCl}\]
(ii) glucose
(iii) urea
(iv) \[\ce{NaCl}\]
Gelatin which is a peptide is added in icecreams. What can be its role?
What is collodion?
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?
How do emulsifying agents stabilise the emulsion?
How does the precipitation of colloidal smoke take place in Cottrell precipitator?
Why is \[\ce{Fe(OH)3}\] colloid positively charged, when prepared by adding \[\ce{FeCl3}\] to hot water?
For coagulating 200 ml of arsenious sulphide sol, 10 ml of 1 m NaCl solution is required find out the flocculation value of NaCl.
Fog is a colloidal solution of ______.
Identify the colloidal molecule containing hydrophilic head and hydrophobic tail within it.
