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The following are some statements about ...

The following are some statements about micelles
I) These are formed as aggregated particles when soap is applied at lower concen trations
II) The tail part of it dissolves the grease deposit or dirt.
III)Hydrocarbon chain of soap micelle is hydrophillic end and its anion part is hydrophobic end.
The correct combination is

A

All are correct

B

Only I and II

C

Only II and III

D

Only II

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the statements about micelles, we will evaluate each statement one by one to determine their correctness. ### Step-by-Step Solution: 1. **Evaluate Statement I**: "These are formed as aggregated particles when soap is applied at lower concentrations." - **Analysis**: Micelles are formed when soap is applied at a specific concentration known as the critical micelle concentration (CMC). This concentration is typically moderate, not low. Therefore, this statement is incorrect. 2. **Evaluate Statement II**: "The tail part of it dissolves the grease deposit or dirt." - **Analysis**: The structure of a soap molecule consists of a hydrophilic (water-attracting) head and a hydrophobic (water-repelling) tail. The hydrophobic tail interacts with grease and dirt, allowing it to dissolve and be washed away. Thus, this statement is correct. 3. **Evaluate Statement III**: "Hydrocarbon chain of soap micelle is hydrophilic end and its anion part is hydrophobic end." - **Analysis**: In soap molecules, the hydrocarbon chain is the hydrophobic part, while the ionic (anion) part is hydrophilic. Therefore, this statement is also incorrect. ### Conclusion: - **Correct Combination**: Based on the evaluations, only Statement II is correct. Therefore, the correct answer is that only the second statement is true. ### Final Answer: The correct combination is: **Only Statement II is correct.** ---
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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 :

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