Which of the following factors contributes to a low viscosity for a liquid?

• A. Large, complex molecular structure
• B. Strong hydrogen bonding
• C. Weak intermolecular forces
• D. High molecular weight

Answer: (C)

Verified step by step guidance

1. Understand that viscosity is a measure of a liquid's resistance to flow; higher viscosity means the liquid flows more slowly.
2. Recognize that viscosity depends largely on the strength of intermolecular forces: stronger forces cause molecules to stick together more, increasing viscosity.
3. Analyze each option: large, complex molecular structures tend to increase viscosity because they can entangle and interact more; strong hydrogen bonding increases intermolecular attraction, raising viscosity; high molecular weight usually means larger molecules, which also tend to increase viscosity.
4. Identify that weak intermolecular forces mean molecules do not attract each other strongly, allowing them to move past one another more easily, which lowers viscosity.
5. Conclude that among the given options, weak intermolecular forces contribute to a low viscosity because they reduce the internal resistance to flow.