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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”.
Write one difference in Multimolecular colloid and Associated colloid
Define the following with a suitable example, of each:
Multimolecular colloid
Define the term Electrophoresis.
What happens when a beam of light is passed through a colloidal sol.
Explain Bredig’s arc method.
Draw labelled diagram Tyndall effect.
Draw labelled diagram of Bredig’s arc method.
Which type of colloid is formed on the dissolution of soap in water?
Froth and whipped cream are examples of ____________.
Which of the following is multimolecular colloid?
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.
In coagulation of positively charged ferric hydroxide sol, the most and least effective ions are ____________ and ____________ respectively.
The precipitation power of an electrolyte increases with ______.
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. \[\ce{NO^-_3}\]
Tyndall effect is observed due to ____________.
Which of the following can form colloidal sol with water?
Pumice stone is an example of ______.
Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?
Gelatin which is a peptide is added in icecreams. What can be its role?
Why is \[\ce{Fe(OH)3}\] colloid positively charged, when prepared by adding \[\ce{FeCl3}\] to hot water?
Toluene is oxidised to benzoic acid by
For coagulating 200 ml of arsenious sulphide sol, 10 ml of 1 m NaCl solution is required find out the flocculation value of NaCl.
Which of the following substances will precipitate the negatively charge emulsion
The migration of dispersion medium under the influence of an electric potential is called ______.
Blood may be purified by ______.
Identify positively charged sol from following.
