Question

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.

• A. 1, 2 and 3
• B. 1, 3 and 4
• C. 2, 3 and 4
• D. 1, 2 and 4

Answer 1

The correct option is A 1, 2 and 3

Smaller the gold number of lyophobic colloid, the larger will be its protective power as the amount of electrolyte required will be minimum.

Lyophilic sols, in contrast to lyophobic sols are easily coagulated on addition of small amounts of electrolytes due to its lower affinity for solvent. these are solvent hating and easily gets coagulated.

Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulates the blood and seals the blood vessel from pouring more blood out of the nerve.