To determine the physical states of argon, carbon, and sulphur at room temperature and pressure, let's examine how these elements generally behave under these conditions:
1. Argon:
- Argon is a noble gas with the atomic number 18.
- It is well-known to exist as a colorless, odorless gas at room temperature and standard atmospheric pressure.
- Therefore, the physical state of argon at room temperature and pressure is a gas.
2. Carbon:
- Carbon is a non-metal with the atomic number 6.
- At room temperature and standard atmospheric pressure, carbon exists in several solid forms, including graphite and diamond.
- Hence, the physical state of carbon at room temperature and pressure is a solid.
3. Sulphur:
- Sulphur is a non-metal with the atomic number 16.
- At room temperature and standard atmospheric pressure, sulphur exists as a yellow crystalline solid.
- Thus, the physical state of sulfur at room temperature and pressure is a solid.
Based on this analysis, we can match the physical states to the given options in the table:
| | argon | carbon | sulphur |
|------|-------|--------|---------|
| A | gas | solid | solid |
| B | gas | liquid | gas |
| C | liquid+| gas | liquid |
| D | solid | liquid | gas |
Therefore, the correct option is A (gas, solid, solid).
