Question

The greater the valence of the flocculating ion added, the greater is its power to cause precipitation of a colloid. This rule is:

• A. Hund's rule
• B. Pauling rule
• C. Henry's rule
• D. Hardy—Schulze rule

Hint:

The Hardy—Schulze rule is an important principle in colloid chemistry, stating that the flocculating power of an ion increases with its valence. This rule helps in understanding the stability and precipitation of colloidal solutions.

Answer 1

The Correct Option is D

Step 1: Understanding the Rule
The statement describes the relationship between the valence of a flocculating ion and its ability to cause precipitation of a colloid. This is a well
known rule in colloid chemistry.
Step 2: Analyzing the Options
Hund's rule: This rule is related to the filling of electron orbitals in atoms, not colloid chemistry.
Pauling rule: This rule is related to the prediction of crystal structures, not colloid chemistry.
Henry's rule: This rule is related to the solubility of gases in liquids, not colloid chemistry.
Hardy—Schulze rule: This rule states that the greater the valence of the flocculating ion, the greater its power to cause precipitation of a colloid.
Step 3: Matching with the Options
The correct rule is the Hardy—Schulze rule, which corresponds to option (D). Final Answer: The correct rule is (D) Hardy—Schulze rule.