Which of the following are properties of lyophobic sols?

Easily coagulated by adding little amount of electrolyte

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Reversible

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Viscosity is more than that of medium

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Particles are less solvated

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct options are
B Easily coagulated by adding little amount of electrolyte
C Particles are less solvated
$Lyophobic colloids (liquid-hating)$
Some substances cannot form colloid just by directly mixing them with a liquid. Their colloidal sols are prepared by special methods and are called lyophobic colloids. They are less viscous than that of medium.

They are also called irreversible colloids as on precipitation, they don’t give back the colloid on simply mixing the dispersed phase and the dispersed medium.

They are unstable and coagulate easily by heating shaking or adding electrolytes.
Hence option A & D are correct.

Suggest Corrections

Similar questions

Which of the following is/are correct ?
i) lyophobic sols are less stable
ii) lyophilic sols are reversible
iii) lyophobic sols are coagulated by adding electrolytes
iv) lyophobic sols are more hydrated

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

Q. Which of the following properties are characteristic of lyophobic sols?
1. Low viscosity; 2. High viscosity; 3. Reversibility and 4. Coagulation by electrolytes at low concentration
Select the correct answer using the codes given below:

Q. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a

10 %

solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.

Gold number of hemoglobin is 0.03. Hence 100 mL of gold sol will require what amount of hemoglobin (in g) so that gold is not coagulated by 1 mL of

10 % N a C l

solution

Q. Which of the following statements are correct?
1. The smaller the gold number of lyophobic colloid, the larger will be its protective power.
2. Lyophilic sols, in contrast to lyophobic sols are easily coagulated on the addition of small amounts of electrolytes.
3. Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulates the blood.
4. The flocculation value of arsenious sulfide sol is independent of the anion of the coagulating electrolyte.

Join BYJU'S Learning Program