Why NaCl is used to clear snow from roads?
Liquid A and B on mixing produce a warm solution.
Which type of deviation does this solution show?

Explanation

### Step-by-Step Text Solution

1. **Understanding the Use of NaCl for Snow Clearance:**
- Sodium chloride (NaCl), commonly known as table salt, is used to clear snow from roads primarily because it lowers the freezing point of water. This phenomenon is known as freezing point depression.
- When NaCl is added to ice or snow, it dissolves in the thin layer of water that is always present on the surface of the ice. This solution has a lower freezing point than pure water, which means that the ice will melt even when the temperature is below 0°C.

2. **Explanation of Freezing Point Depression:**
- The presence of NaCl disrupts the formation of ice crystals, thus preventing the water from freezing at its normal freezing point (0°C). As a result, the ice melts, making it easier to clear the roads.
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