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### Q.10
**Question:**  
When 10 g of bleaching powder is dissolved in water to make a total volume of 1 L, the pH of approximately 10 is observed. What is the nature of the solution, and how does the pH relate to its disinfecting properties?

**Answer:**  
- The pH of 10 indicates that the solution is basic (alkaline).
- The correct option here is **(C) The solution is basic, which helps in enhancing its disinfecting properties**.

### Q.11
**Question:**  
Bleaching powder dissolves in water to form:

**Answer:**  
The dissolution of bleaching powder in water generally forms calcium hydroxide and chlorine gas. The equation:
\[ \text{CaOCl}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{Cl}_2 \]
So, the correct option is **(A) Ca(OH)₂, Cl₂**.

### Q.12
**Question:**  
If the pH of a 0.1 M solution of a base is 11, what is the concentration of hydroxide ions in the solution?

**Explanation:**  
For a solution with pH = 11:
- The pOH = 14 - pH = 14 - 11 = 3.
- The concentration of hydroxide ions, \([OH^-]\), is given by:
  \[
  [OH^-] = 10^{-\text{pOH}} = 10^{-3} \text{M}
  \]
Thus, the correct option is **(A) 1 × 10⁻³ M**.

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### Related Questions:
1. How does the basic nature of a solution affect its cleaning properties?
2. What is the chemical composition of bleaching powder?
3. How is the concentration of hydroxide ions related to the pH and pOH of a solution?
4. What reactions occur when chlorine gas is dissolved in water?
5. Can the pH of a solution affect its ability to act as a disinfectant?

### Tip:
Remember that pH and pOH are related through the equation \( \text{pH} + \text{pOH} = 14 \), and this relationship is useful for calculating ion concentrations in acidic and basic solutions.

When 10 g of bleaching powder is dissolved in water to make a total volume of 1 L, the pH of approximately 10 is observed. What is the nature of the solution, and how does the pH relate to its disinfecting properties? Also, related questions about bleaching powder dissolving and pH calculation.

Learn how to calculate the pH and hydroxide ion concentration of a base solution and understand the chemistry behind bleaching powder's disinfecting properties. This problem is suitable for high school students, covering key concepts such as pH-pOH balance and ion concentration calculations.

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