Out of the following which component can occur in all three states liquid ,solid and gaseous form

Options

A. water
B. phosphorus
C. carbon
D. oxygen

Answer

To determine which component can exist in all three states of matter—solid, liquid, and gas—we need to analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Water
- Phosphorus
- Carbon
- Oxygen

2. **Analyze Each Option**:
- **Water**:
- Solid state: Ice (frozen water)
- Liquid state: Water (liquid form)
- Gaseous state: Water vapor (steam when boiled)
- Conclusion: Water can exist in all three states.

- **Phosphorus**:
- Solid state: White or red phosphorus (solid form)
- Liquid state: Phosphorus can melt to a liquid, but it does not exist as a gas under normal conditions.
- Conclusion: Phosphorus does not exist in all three states.

- **Carbon**:
- Solid state: Graphite or diamond (solid forms of carbon)
- Liquid state: Carbon does not have a stable liquid state at normal conditions; it sublimates instead.
- Gaseous state: Carbon can exist as carbon vapor at high temperatures, but not in a stable gaseous state under normal conditions.
- Conclusion: Carbon does not exist in all three states.

- **Oxygen**:
- Solid state: Solid oxygen (at very low temperatures)
- Liquid state: Liquid oxygen (at low temperatures)
- Gaseous state: Oxygen gas (common form at room temperature)
- Conclusion: Oxygen can exist in all three states.

3. **Final Comparison**:
- Water: Exists in solid (ice), liquid (water), and gas (steam).
- Phosphorus: Does not exist in gaseous form under normal conditions.
- Carbon: Does not have a stable liquid state under normal conditions.
- Oxygen: Exists in solid, liquid, and gaseous forms.

4. **Conclusion**: The component that can occur in all three states (solid, liquid, and gas) is **Water**.

### Answer: Water

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