Which of the following are exothermic processes?
1. Reaction of water with quick lime
2. Dilution of an acid
3. Evaporation of water
4. Sublimation of camphor (crystals)

Options

A. 1 and 2
B. 2 and 3
C. 1 and 4
D. 3 and 4

Explanation

To determine which of the given processes are exothermic, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Reaction of Water with Quick Lime:**
- When water (H2O) reacts with quick lime (calcium oxide, CaO), it forms calcium hydroxide (Ca(OH)2).
- This reaction releases a significant amount of heat.
- **Conclusion:** This is an exothermic process.

2. **Dilution of an Acid:**
- Dilution of an acid involves adding water to an acid.
- This process also releases heat, making it highly exothermic.
- **Conclusion:** This is an exothermic process.

3. **Evaporation of Water:**
- Evaporation is the process where water changes from liquid to vapor.
- This requires the absorption of heat from the surroundings, making it an endothermic process.
- **Conclusion:** This is not an exothermic process.

4. **Sublimation of Camphor (Crystals):**
- Sublimation is the transition of a substance from solid to gas without passing through the liquid phase.
- This process also requires heat, thus it is endothermic.
- **Conclusion:** This is not an exothermic process.

### Final Conclusion:
From the analysis above, the exothermic processes are:
- 1. Reaction of water with quick lime
- 2. Dilution of an acid

Thus, the correct answer is that options 1 and 2 are exothermic processes.

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