Question

The number of positively and negatively charged sols respectively in the following are:
TiO\(_2\), blood, CdS, Cu, Ag, Clay, SiO\(_2\), Fe\(_2\)O\(_3\)

• A. 5, 3
• B. 3, 5
• C. 6, 2
• D. 4, 4

Hint:

Charge on sol particles depends on adsorption of ions and the nature of the colloid.

Answer 1

The Correct Option is D

Step 1: Identify positively charged sols.
Metal oxide sols prepared in acidic medium carry a positive charge: TiO\(_2\), Fe\(_2\)O\(_3\), and metal sols like Ag and Cu sols -- 4 sols.

Step 2: Identify negatively charged sols.
SiO\(_2\), clay, CdS, and blood are all negatively charged -- 4 sols.
\[ \boxed{4,\ 4} \]