Coagualation of Lyophilic Sols

Q. Given below are two statements
Statement I:
In the coagulation of a negative sol, the flocculating power of the three given ions is in the order $A{l}^{3+}>B{a}^{2+}>N{a}^{+}$
Statement II:
In the coagulation of a positive sol, the flocculating power of the three given salts is in the order $NaCl>N{a}_{2}S{O}_4>N{a}_{3}P{O}_4$
In the light of the above statements, choose the most appropriate answer from the options given below.

1. Statement I is incorrect but statement II is correct
2. Both Statement I and Statement II are correct
3. Statement I is correct but Statement II is incorrect
4. Both Statement I and Statement II are incorrect.

Q. Bleeding is stopped by the application of ferric chloride. This is because:

1. The blood is coagulated and thus, the blood vessel is sealed
2. The blood starts flowing in opposite direction
3. The blood reacts and forms a solid, which seals the blood vessel
4. The ferric chloride seals the blood vessel

Q. Which of the salt-solution is most effective for coagulation of arsenious sulphide?

1. $BaC{l}_2$
2. $AlC{l}_3$
3. $N{a}_{3}P{O}_4$
4. $NaCl$

Q. Find the positively charged sol from the following

1. Ag
2. $\mathrm{Al}(\mathrm{OH}{)}_3$
   
3. Methylene blue
4. Congo red

Q. Which of the following statement is incorrect regarding lyophilic colloids?

1. Particles of dispersed phase have a great affinity for the dispersion medium.
2. Lyophilic colloids are easily made than lyophobic colloids
3. Lyophilic colloids are irreversible in nature
4. Glue, gelatin, and starch are some examples of lyophilic colloids
   

Q. Bleeding is stopped by the application of ferric chloride. This is because:

1. The blood starts flowing in opposite direction
2. The blood reacts and forms a solid, which seals the blood vessel
3. The blood is coagulated and thus, the blood vessel is sealed
4. The ferric chloride seals the blood vessel

Q.

What is coagulation of lyophobic colloids?

Q. Which of the following statement (s) is/are correct regarding lyophilic colloids?

1. Particles of dispersed phase have a great affinity for the dispersion medium.
2. Lyophilic colloids are easily made than lyophobic colloids
3. Lyophilic colloids are irreversible in nature
4. Glue, gelatin, and starch are some examples of lyophilic colloids
   

Q. For coagulating $A{s}_2{S}_3$ colloidal sol, which of the following will have the highest coagulation value :

1. $NaCl$
2. $KCl$
3. $BaC{l}_2$
4. $AlC{l}_3$

Q.

How does surface tension varies according to lyophobic and lyophilic colloids and pls explain me the reason why does surface tension varies that way

Q. What is correct sequence of the increasing coagulation value of the following electrolyte for the coagulation of $Fe(OH{)}_3$ solution?
$\left(i\right)N{a}_{3}P{O}_4,\left(ii\right)KCl,\left(iii\right)K_{2}S{O}_4,\left(iv\right)K_4\left[Fe\right(CN{)}_6]$

1. $iv>i>iii>ii$
2. $ii>iii>i>iv$
3. $i>ii>iii>iv$
4. $iv>iii>ii>i$

Q.

Conductivity of 0.00241 M acetic acid is 7.896 × 10⁻⁵ S cm⁻¹. Calculate its molar conductivity and if for acetic acid is 390.5 S cm² mol⁻¹, what is its dissociation constant?

Q. 13.As2S3 sol is a positive, negative or neutral colloid?(or All of these)

Q. Which of the following is a hydrophilic colloidal sol:

1. Barium sulphate sol
2. Arsenious sulphide sol
3. Starch sol
4. Silver iodide sol

Q. On which of the following properties does the coagulating power of an ion depend?

1. The sign of charge on the ion alone
2. The magnitude of the charge on the ion alone
3. Size of the ion alone
4. Both magnitude and sign of the charge on the ion

Q.

A dispersion of AgCl in water is:

1. hydrophilic colloid

2. hydrophobic sol

3. an aerosol

4. an emulsion

Q. 13. Calculate the total charge in 3gm of carbonate ion

Q.

What are emulsions?

Q. 57. Why surface tension of lypophillic colloid is lower than dispersion medium, viscosity higher than dispersion medium.But viscosity, surface tension is same as that of dispersion medium for lypophobic colloids.

Q. Assertion :In the coagulation of negatively charged arsenic sulphide sol, the coagulating power decreases in the order $A{l}^{3+}>B{a}^{2+}>N{a}^{+}$. Reason: Generally, greater the valency of coagulating ion, the greater is its power of coagulation.

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 incorrect but Reason is correct
4. Both Assertion and Reason are correct

Q. Which of the following cations will have minimum flocculation value for arsenic sulphide solution?

1. ${Na}^{+}$
2. ${Mg}^{2+}$
3. ${Ca}^{2+}$
4. ${Al}^{3+}$

Q. When sodium gives one electron to chlorine then which ion will sodium has positive or negative ion?

Q. 5. Why micelles have lower colligative properties than normal colloidal solution

Q. 3. Which is the least effective substance for the coagulation of. Fe(OH)3 colloid?? K2SO4 K3PO4 KBr K[Fe(CN)6]

Q. What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on addition of small amounts of electrolytes?

Q.

Explain what is observed

(i) When a beam of light is passed through a colloidal sol.

(ii) An electrolyte, NaCl is added to hydrated ferric oxide sol.

(iii) Electric current is passed through a colloidal sol?

Q. The best coagulant for the precipitation of $Fe(OH{)}_3$ sol is:

1. $N{a}_{2}HP{O}_3$
2. $NaN{O}_3$
3. $N{a}_{3}P{O}_4$
4. $N{a}_{2}S{O}_4$

Q. Among the electrolytes $N{a}_{2}S{O}_4,CaC{l}_2,A{l}_2(S{O}_4{)}_3$ and $N{H}_{4}Cl,$ the most effective coagulating agent for $S{b}_2{S}_3$ solution is:

1. $N{a}_{2}S{O}_4$
2. $N{H}_{4}Cl$
3. $A{l}_2(S{O}_4{)}_3$
4. $CaC{l}_2$

Q.

Gelatin which is a peptide is added in ice creams. What can be its role.

Q. Which one of the following statements is false for hydrophilic colloids?

1. They do not require electrolytes for stabillity
2. Their coagulation is reversible
3. Their surface tension is usually lower than that of dispersion medium
4. Their viscosity is of the order of that of water