Question

In which of the following, the sol is not correctly matched with respect to its charge?

• A. \( \text{Al}_2\text{O}_3 \cdot x\text{H}_2\text{O} \) sol : +ve sol
• B. \( \text{Al}_2\text{O}_3 \cdot x\text{H}_2\text{O} \) sol : -ve sol
• C. Starch sol : +ve sol
• D. \( \text{TiO}_2 \) sol : -ve sol

Hint:

Remember that sols like \( \text{TiO}_2 \) are typically negatively charged and starch forms a negative sol, not positive.

Answer 1

The Correct Option is C

- The sol formed by \( \text{TiO}_2 \) is negatively charged. - \( \text{Al}_2\text{O}_3 \cdot x\text{H}_2\text{O} \) can form both positive and negative sols depending on the nature of the conditions, but typically, it forms positive sols. - Starch forms a negative sol and not a positive one. Therefore, option (3) is incorrect. Thus, the correct answer is \( \boxed{(3)} \).