Question

We can easily move our hand in air because___________.
A. The particles of air have high force of attraction
B. The particles of air have less space between them
C. The particles of air are highly compressible
D. The particles of air are loosely bound

Answer 1

Hint: The interspace between the particles is going to decide whether we can easily move our hand easily in the given medium or not. In case of solids the interspace between the particles is very less when compared to liquids and gases.

Complete answer:
- In the question it is given why we can move our hands easily in the air.
- We have to find the reason why we can move our hand easily in air when compared to liquid and solids.
- Coming to the concept of intermolecular space, intermolecular space between the particles in solid state is very less.
- The intermolecular space in between the particles of liquid state is high compared to solid state.
- The intermolecular space in between the particles of gaseous state is very high when compared to liquid and solid state.
- So, the intermolecular space is very high in air (gaseous state) means the particles are loosely bound in air.
- Therefore we can move our hand very easily in air due to the particles of air being loosely bound.

- So, the correct option is D.

Note: If the intermolecular space is very high then the force of attraction between the particles is very less. Intermolecular space of the particles is inversely proportional to force of the attraction between the particles.