Question

We can easily move our hand in the air, but not through a solid block of wood because

• A. Intermolecular forces between the molecules of a gas are almost negligible
• B. Intermolecular forces between the molecules of a gas are more than wooden molecules
• C. In wood, intermolecular spaces are very small compared to gases.
• D. In gas, intermolecular spaces are very small compared to wood.

Answer 1

Answer: (A), (C)

The correct options are
A

Intermolecular forces between the molecules of a gas are almost negligible

C

In wood, intermolecular spaces are very small compared to gases.

In the air, intermolecular forces between the molecules are almost negligible and intermolecular spaces are very large. Thus, we can easily move our hand in the air, without any extra force.
In wood, intermolecular forces between the molecules are very large and intermolecular spaces are very small. Thus, a lot of force is required to separate the molecules of wood.