The dominant forces between molecules (intermolecular forces) are ____ in origin.

• A. electrostatic
• B. electrodynamic
• C. electromagnetic
• D. gravitational
• E. magnetic

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the concept of intermolecular forces. These are forces that act between molecules, influencing their physical properties such as boiling and melting points.
2. Step 2: Consider the types of forces listed in the options: electrostatic, electrodynamic, electromagnetic, gravitational, and magnetic. Each of these forces has a different origin and effect.
3. Step 3: Focus on electrostatic forces. These are forces that occur due to the attraction between charged particles, such as ions or polar molecules. They are a key component of intermolecular forces.
4. Step 4: Compare electrostatic forces with the other options. Electrodynamic forces involve moving charges, electromagnetic forces involve electric and magnetic fields, gravitational forces are due to mass, and magnetic forces involve magnetic fields.
5. Step 5: Conclude that intermolecular forces are primarily electrostatic in origin, as they arise from the attraction between charged or polar molecules, which is a fundamental aspect of chemistry.