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A colloidal solution is subjected to an ...

A colloidal solution is subjected to an electrical field. The particle move towards anode. The coagulation of same sol is studied using `NaCl, BaCl_(2)` and `AlCl_(3)` solutions. Their coagulating power should be

A

`NaCl gt BaCl_(2) gt AlCl_(3)`

B

`BaCl_(2) gt AlCl_(3) gtNaCl`

C

`AlCl_(3) gt BaCl_(2) gt NaCl`

D

`BaCl_(2) gtNaCl gt AlCl_(3)`

Text Solution

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The correct Answer is:
C
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The colloidal particles are electrically charged as a indicated by their migration towards cathode or anode under the applied electric field. In a particular colloidal system, all particles carry either positive charge or negative charge. The electric charge on colloidal particles orginate in several ways. According to preferential adsorption theory, the freshly obtained precipitate particles adsorb ions from the dispersion medium, which are common to their lattice and acquire the charge of adsorbed ions. For example, For example, freshly obtained Fe(OH)_(3) precipitated is dispersed, by a little FeCl_(3) , into colloidal solution owing to the adsorption of Fe^(3+) ions in preference. Thus sol particles will be positively charged. In some cases the colloidal particles are aggregates of cations or anions having ampiphilic character. When the ions posses hydrophobic part (hydrocarbon end) as well as hydrophilic part (polar end group), they undergo association in aqueous solution to form particles having colloidal size. The formation of such particles, called micelles plays a very important role in the solubilization of water insoluble substances, (hydrocarbon, oils, fats, grease etc.). In micelles, the polar end groups are directed towards water and the hydrocarbon ends into the centre. The charge on sol particles of proteins depends on the pH. At low pH, the basic group of protein molecule is ionized (protonated) and at higher pH (alkaline medium), the acidic group is ionized. At isoelectric pH, characteristic to the protein, both basix and acidic groups are equally ionized. The stability of colloidal solution is attributed largely to the electric charge of the dispersed particles. This charge causes them to be coagulated or precipitated. On addition of small amount of electrolytes, the ions carrying oppiste charge are adsorbed by sol particles resulting in the neutralization of their charge. When the sol particles either with no charge or reduced charge, come closer due to Brownian movement, they coalesce to form bigger particles resulting in their separation from the dispersion medium. This is what is called coagulating or precipitation of the colloidal solution. The coagulating power of the effective ion, which depend on its charge, is expressed in terms of its coagulating value, defined as its minimum concentration (m mol/L) needed to precipitate a given sol. Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl, Na_(2)SO_(4) and Na_(3)PO_(4) solutions. Their coagulating values will be in the order :

Under the influemce of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl,Na_(2)SO_(4) , and Na_(3)PO_(4) solutions. Their coagulation values will in the order a. NaClgtNa_(2)SO_(4)gtNa_(3)PO_(4) b. Na_(2)SO_(4)gtNa_(3)PO_(4)gtNaCl c. Na_(3)PO_(4)gtNa_(2)SO_(4)gtNaCl d. Na_(2)SO_(4)gtNaClgtNa_(3)PO_(4)

GRB PUBLICATION-SURFACE CHEMISTRY-E. Coagulation, Protection and Application of Colloids
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  4. Which of the following is most effective in coagulating a ferric hydro...

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  5. Smoke has generally blue tinge. It is due to

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  6. Gold number of haemoglobin is 0.03. Hence, 100 mL of gold sol will req...

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  7. Arsenic (III) sulphide forms a sol with a negative charge. Which of th...

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  8. Blood is purified by :

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  9. Most effective ion to coagulate a negative sol is :

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  10. Identify the statement which is correct w.r.t. surface phenomenon.

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  11. Which of the following electrolytes is most effective in the coagulati...

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  12. Which of the following is property of colloid?

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  13. An arsenious sulphide sol carries a negative charge . The maximum prec...

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  14. Tyndall effect is shown by

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  15. According to Hardy Schulze rule, the power of coagulation of an ion de...

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  16. Among the electrolytes Na(2),SO(4),CaCl(2),Al(2)(SO(4))(3) and NH(4)Cl...

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  17. The dispersed phase in colloidal iron (III) hydroxide and collodial go...

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  18. Gold numbers of protective colloids A,B,C and D are 0.5,0.01,0.10 and ...

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  19. On passing light from colloidal solution, the effect due to scattering...

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  20. The solution in which the light is scattered by the particles is :

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