(b)liquid water is correct option . Because it is a molecular solid and molecular solid has weak interparticle forces of attraction.

Answer:

Introduction: The interparticle forces of attraction are the forces that hold the particles of matter together. The strength of these forces varies from one state of matter to another.

Type of matter with weakest interparticle forces of attraction:

(a) Steam has the weakest interparticle forces of attraction among the given options.

Explanation:

- Steam is a gaseous state of water molecules.
- In gaseous state, the particles have a lot of kinetic energy and move freely in all directions.
- The intermolecular forces of attraction between the gas particles are very weak.
- Due to the weak forces of attraction, the particles move randomly and occupy the entire volume of the container.

(b) Liquid water has stronger interparticle forces of attraction than steam.

Explanation:

- In the liquid state, the water molecules are closer to each other than in the gaseous state.
- The intermolecular forces of attraction between the liquid particles are stronger than in gases.
- Due to the stronger intermolecular forces of attraction, the liquid particles are more closely packed, and the liquid occupies a definite volume.

(c) Sand is a solid state of matter.

Explanation:

- In the solid state, the particles are very closely packed, and the intermolecular forces of attraction between the particles are very strong.
- The particles vibrate about their mean position, but their position is fixed.
- Due to the strong intermolecular forces of attraction, the solid has a definite shape and volume.

(d) Iron is also a solid state of matter.

Explanation:

- In solids like iron, the intermolecular forces of attraction between the particles are very strong.
- The particles are closely packed and have a fixed position.
- The particles vibrate about their mean position.
- Due to the strong intermolecular forces of attraction, the solid has a definite shape and volume.

Conclusion: Hence, steam has the weakest interparticle forces of attraction among the given options.