Cationic Micelle Formation

Q. Among the following, the surfactant that will form micelles in an aqueous solution at the lowest molar concentration at the ambient condition is:

1. $C{H}_3\left(C{H}_2{)}_{11}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$
2. $C{H}_3\left(C{H}_2{)}_{15}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$
3. $C{H}_3(C{H}_2{)}_{11}OS{O}_3^{-}N{a}^{+}$
4. $C{H}_3(C{H}_2{)}_{6}CO{O}^{-}N{a}^{+}$

Q. For the reaction, N2 + 3H2 2NH3, the rate of change of concentration for hydrogen is 4 g/h. The rate of change of concentration of NH3 is

Q. Surfactant molecules can cluster together as micelles, which are colliod sized cluster of molecules. Micelles form only above critical micelle concentration (CMC) and above certain temperature called Kraft temperature. $\Delta H$ of micelle formation can be positive or negative. Which of the following is NOT TRUE about micelle formation?

1. The hydrophobic part lie towards interior of micelle
2. The hydrophillic part lie towards surface of micelle
3. $\Delta S$ of micelle formation is negative
4. $\Delta S$ of micelle formation is positive

Q. Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:

1. $C{H}_3\left(C{H}_2{)}_{15}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$
2. $C{H}_3(C{H}_2{)}_{11}OS{O}_3^{-}N{a}^{+}$
3. $C{H}_3(C{H}_2{)}_{6}CO{O}^{-}N{a}^{+}$
4. $C{H}_3\left(C{H}_2{)}_{11}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$

Q.

Among the following electrolytes, which is the most effective coagulating agent for $S{b}_2{S}_3$ solution?

1. $N{a}_{2}S{O}_4$

2. $CaC{l}_2$

3. $A{l}_2(S{O}_4{)}_3$

4. $N{H}_{4}Cl$

Q.

Bromine monochloride, BrCl decomposes into bromine and chlorine and reaches the equilibrium:

for which K_c= 32 at 500 K. If initially pure BrCl is present at a concentration of 3.3 × 10^–3 molL^–1, what is its molar concentration in the mixture at equilibrium?

Q. Select the correct statement about CMC (Critical Miscelle Concentration):

1. CMC increases with the total surfactant concentration
2. When a sol has a concentration higher than CMC, lamellar micelles that have extended parallel sheets are formed
3. All the above are correct
4. As temperature increases, CMC initially decreases then increases slightly

Q. Assertion :Surfactant molecules form micelles above the critical micelle concentration (CMC). Reason: The conductance of solution of surfactant molecules decreases sharply at the (CMC).

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Which of the following factors are responsible for the stability of lyophilic sols?

1. Charge on the colloidal particles
2. Solvation of colloidal particles
3. Both a and b
4. None of the above

Q. At CMC, the surfactant molecules

1. Associate
2. Decompose
3. Become completely soluble
4. Dissociate

Q. Assertion :Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). Reason: The conductivity of solution having surfactant molecules decreases sharply at the CMC.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q.

Bromine monochloride, BrCl decomposes into bromine and chlorine and reaches the equilibrium:

for which K_c= 32 at 500 K. If initially pure BrCl is present at a concentration of 3.3 × 10^–3 molL^–1, what is its molar concentration in the mixture at equilibrium?

Q. At higher concentrations, some particles tend to form micelles and this kind of micelle formation takes place only above a particular temperature. That temperature is called

1. Boyle temperature
2. Kraft temperature
3. Critical temperature
4. Curie temperature

Q. At the critical micelle concentration (CMC), the surfactant molecules:

1. dissociate
2. associate
3. become completely soluble
4. decompose

Q. Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambinent condition is:

1. $C{H}_3\left(C{H}_2{)}_{15}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$
2. $C{H}_3(C{H}_2{)}_{11}OS{O}_{3^{-}}N{a}^{+}$
3. $C{H}_3(C{H}_2{)}_{6}CO{O}^{-}N{a}^{+}$
4. $C{H}_3\left(C{H}_2{)}_{11}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$

Q. What is CMC and Kraft's temperature ?

Q. Assertion :Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). Reason: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. At higher concentrations, some particles tend to form micelles and this kind of micelle formation takes place only above a particular temperature. That temperature is called

1. Boyle temperature
2. Kraft temperature
3. Critical temperature
4. Curie temperature

Q. Surfactant molecules can cluster together as micelles, which are colliod sized cluster of molecules. Micelles form only above critical micelle concentration (CMC) and above certain temperature called Kraft temperature. $\Delta H$ of micelle formation can be positive or negative. Which of the following is NOT TRUE about micelle formation?

1. $\Delta S$ of micelle formation is positive
2. The hydrophobic part lie towards interior of micelle
3. The hydrophillic part lie towards surface of micelle
4. $\Delta S$ of micelle formation is negative

Q. Consider the following statements for micelles, which is/are correct?

1. Micelles from ionic surfactants can be formed only above a certain temperature called the Kraft temperature
2. Micelle formation is exothermic
3. At critical micelle concentration, several properties of solution of surfactants such as molar conductivity , surface tension and osmotic pressure change
4. Micelles are associated colloids

Q. At CMC, the surfactant molecules undergoes :

1. association
2. aggregation
3. micelle formation
4. all of the above

Q. Among the following, the surfactant that will form micelles in an aqueous solution at the lowest molar concentration at the ambient condition is:

1. $C{H}_3\left(C{H}_2{)}_{15}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$
2. $C{H}_3(C{H}_2{)}_{11}OS{O}_3^{-}N{a}^{+}$
3. $C{H}_3(C{H}_2{)}_{6}CO{O}^{-}N{a}^{+}$
4. $C{H}_3\left(C{H}_2{)}_{11}{N}^{+}\right(C{H}_3{)}_{3}B{r}^{-}$

Q. At higher concentrations, some particles tend to form micelles and this kind of micelle formation takes place only above a particular temperature. That temperature is called

1. Boyle temperature
2. Kraft temperature
3. Critical temperature
4. Curie temperature

Q. Select the correct statement about CMC (Critical Miscelle Concentration):

1. CMC increases with the total surfactant concentration
2. When a sol has a concentration higher than CMC, lamellar micelles that have extended parallel sheets are formed
3. As temperature increases, CMC initially decreases then increases slightly
4. All the above are correct

Q. Surfactant molecules can cluster together as micelles, which are colliod sized cluster of molecules. Micelles form only above critical micelle concentration (CMC) and above certain temperature called Kraft temperature. $\Delta H$ of micelle formation can be positive or negative. Which of the following is NOT TRUE about micelle formation?

1. $\Delta S$ of micelle formation is positive
2. The hydrophobic part lie towards interior of micelle
3. The hydrophillic part lie towards surface of micelle
4. $\Delta S$ of micelle formation is negative

Q. (a) Name the reaction which is usually used in the conversion of vegetable oils to fats. Explain the reaction involved in detail. Write a chemical equation to illustrate your answer.
(b) What is saponification? Write the chemical equation of the reaction involved in this process. Name all the substances which take part in this process and also those which are formed.
(c) Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents like ethanol also?

Q. At higher concentrations, some particles tend to form micelles and this kind of micelle formation takes place only above a particular temperature. That temperature is called

1. Boyle temperature
2. Kraft temperature
3. Critical temperature
4. Curie temperature

Q. Which temperature is related to micelle formation?

1. Critical temperature
2. Inversion temperature
3. Reduced temperature
4. Kraft temperature

Q.

At CMC, the surfactant molecules undergo:

1. Association

2. Aggregation

3. Micelle formation

4. All of these

Q. Select the correct statement about CMC (Critical Miscelle Concentration):

1. CMC increases with the total surfactant concentration
2. When a sol has a concentration higher than CMC, lamellar micelles that have extended parallel sheets are formed
3. As temperature increases, CMC initially decreases then increases slightly
4. All the above are correct