A bottle of water at `0^(@)C` is opened on the surface of moon. Which of the following correctly expresses the behaviour of water in it ?

Options

A. It will freeze
B. It will decompose into `H_(2)` and `O_(2)`
C. It will boil
D. None of the above

Explanation

To solve the problem of what happens to a bottle of water at 0°C when it is opened on the surface of the Moon, we can analyze the situation step by step.

### Step-by-Step Solution:

1. **Understanding the Initial Condition**:
- The water in the bottle is at a temperature of 0°C. At this temperature, water can exist in both liquid and solid states (ice).

2. **Atmospheric Conditions on the Moon**:
- The Moon has a very thin atmosphere, which is almost a vacuum. This means that the pressure on the Moon is significantly lower than on Earth, effectively approaching zero.

3. **Behavior of Water Molecules**:
- Water molecules at 0°C have some kinetic energy and are in constant motion. In a normal atmosphere (like on Earth), there is a balance between the molecules escaping from the liquid and those returning to it.

4. **Effect of Low Pressure**:
- When the bottle is opened on the Moon, the pressure around the water drops to nearly zero. This lack of atmospheric pressure allows the water molecules at the surface to escape more easily.

5. **Phase Change**:
- Due to the low pressure, the water will not remain in the liquid state. Instead, the molecules will gain enough energy to escape into the gas phase. This process is akin to boiling, where liquid water turns into vapor.

6. **Conclusion**:
- Therefore, when the bottle of water at 0°C is opened on the Moon, the water will behave as if it is boiling and will quickly turn into vapor due to the lack of atmospheric pressure.

### Final Answer:
The water will boil and turn into vapor when the bottle is opened on the surface of the Moon.

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