Question

The charge on colloidal particles of Fe\(_2\)O\(_3 \cdot xH_2O\) is:

• A. Negative
• B. Positive
• C. No charge
• D. None of these

Hint:

Metal oxides in colloidal form generally acquire charge depending on the medium; Fe\(_2\)O\(_3\) sol is positively charged in water.

Answer 1

The Correct Option is B

Step 1: Nature of ferric oxide sol.
Ferric oxide sol (Fe\(_2\)O\(_3 \cdot xH_2O\)) is a positively charged colloid when dispersed in water. This is because Fe\(^ {3+}\) ions from hydrolysis impart a positive charge to the dispersed particles.
Step 2: Verification of options.
- (A) Negative: Incorrect, ferric oxide sol is not negatively charged.
- (B) Positive: Correct, because it acquires Fe\(^ {3+}\) ions.
- (C) No charge: Incorrect, as colloidal particles always carry some charge.
- (D) None of these: Incorrect, as positive charge is correct.
Step 3: Conclusion.
Hence, the charge on colloidal particles of Fe\(_2\)O\(_3 \cdot xH_2O\) is positive.