Read the given passage and answer the questions.
Suhana wanted her house to be white washed, She bought 10 kg of quicklime from the market and dissolved it in 30 L of water. On adding lime to water, she observed that the water started boiling even when it was not being heated.
Which of the following statements is correct about the above reaction based on your observations?
(i) It is an endothermic reaction.
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven.
(iv) The pH of the resulting solution will be less than seven.

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (iii) and (iv)

Explanation

To solve the question, we will analyze the reaction that occurs when quicklime (calcium oxide, CaO) is added to water. The steps are as follows:

### Step 1: Identify the Reaction
When quicklime (CaO) is added to water, it reacts to form slaked lime (calcium hydroxide, Ca(OH)₂). The reaction can be represented as:
\[ \text{CaO (s)} + \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 (aq) \]

### Step 2: Determine the Nature of the Reaction
The passage states that the water started boiling even when it was not being heated. This indicates that heat is being released during the reaction.

- **Exothermic Reaction:** In an exothermic reaction, heat is released into the surroundings, causing an increase in temperature. Since the water boiled, this suggests that the reaction is exothermic.

### Step 3: Analyze the pH of the Resulting Solution
The resulting solution after the reaction is calcium hydroxide, which is a base.

- **pH of Basic Solutions:** The pH of a basic solution is greater than 7. Therefore, the pH of the resulting solution will be more than 7.

### Step 4: Evaluate the Given Statements
Now, we will evaluate the provided statements based on our analysis:

1. **(i) It is an endothermic reaction.** - **Incorrect** (The reaction is exothermic, not endothermic.)
2. **(ii) It is an exothermic reaction.** - **Correct** (The reaction releases heat.)
3. **(iii) The pH of the resulting solution will be more than seven.** - **Correct** (The solution is basic.)
4. **(iv) The pH of the resulting solution will be less than seven.** - **Incorrect** (The solution is not acidic.)

### Conclusion
The correct statements based on the observations are (ii) and (iii).

### Final Answer
- The correct statements are:
- (ii) It is an exothermic reaction.
- (iii) The pH of the resulting solution will be more than seven.

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