Substances that Cannot Exist in Certain States

Substances can exist in different states such as solid, liquid, and gas depending on the temperature and pressure conditions. However, some substances cannot exist in certain states due to their unique properties.

Cannot Exist in Gaseous State

Some substances cannot exist in the gaseous state under normal conditions. These substances have high boiling points and low vapor pressures, making it difficult for them to evaporate and form a gas. Examples of such substances include:

- Gold: Gold has a boiling point of 2,807°C, which is much higher than the melting point of most metals. Therefore, it cannot exist in the gaseous state under normal conditions.

- Sodium chloride: Sodium chloride (table salt) has a high melting point of 801°C and a low vapor pressure, making it difficult to form a gas. Thus, it cannot exist in the gaseous state under normal conditions.

Cannot Exist in Liquid State

Some substances cannot exist in the liquid state under normal conditions due to their low boiling points and high vapor pressures. These substances tend to evaporate quickly and form a gas. Examples of such substances include:

- Helium: Helium has a boiling point of -268.9°C, which is close to absolute zero. Therefore, it cannot exist in the liquid state under normal conditions.

- Ethanol: Ethanol has a boiling point of 78.5°C and a relatively high vapor pressure, making it difficult to keep in the liquid state under normal conditions.

Cannot Exist in Liquid or Gaseous State

Some substances cannot exist in either the liquid or gaseous state due to their unique properties. These substances are known as sublimation substances, which can transition directly from solid to gas or vice versa. Examples of such substances include:

- Dry ice: Dry ice is solid carbon dioxide that sublimates at room temperature and pressure, forming a gas.

- Iodine: Iodine is a solid that sublimates at room temperature and pressure, forming a purple gas.

In conclusion, some substances cannot exist in certain states due to their unique properties. Understanding the properties of substances is crucial in various fields such as chemistry, physics, and material science.

Substance like diamond cannot exist in liquid as well as gaseous state so it depends upon the particles and their chemical nature of different substances. some substances can exist in all the three states for example water. Some can exist only in solid and gaseous state like camphor. So it depends upon their chemical nature, temperatures, forces of attraction between particles etc.