Which element exist as a solid at `25^@C` and 1 atmospheric pressure among the following

Options

A. Br
B. Cl
C. Hg
D. P

Explanation

To determine which element exists as a solid at 25°C and 1 atmospheric pressure, we will analyze the states of the given elements based on their properties at standard conditions.

### Step-by-Step Solution:

1. **Identify the Elements**: The elements mentioned in the question are likely to include bromine (Br), mercury (Hg), chlorine (Cl), and phosphorus (P).

2. **Determine the States of Each Element at 25°C and 1 atm**:
- **Bromine (Br)**: At 25°C, bromine is a liquid.
- **Mercury (Hg)**: At 25°C, mercury is also a liquid.
- **Chlorine (Cl)**: At 25°C, chlorine is a gas.
- **Phosphorus (P)**: At 25°C, phosphorus exists as a solid (specifically, white phosphorus).

3. **Conclusion**: Among the elements listed, phosphorus is the only element that exists as a solid at 25°C and 1 atmospheric pressure.

### Final Answer:
Phosphorus (P) is the element that exists as a solid at 25°C and 1 atmospheric pressure.

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