Which of the following statements is correct about diffusion?

• A. Diffusion is the movement of particles from an area of lower concentration to an area of higher concentration.
• B. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
• C. Diffusion requires energy input to occur.
• D. Diffusion occurs only in liquids.

Answer: (B)

Verified step by step guidance

1. Understand the concept of diffusion: Diffusion is a process where particles move from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
2. Identify the correct statement: The correct statement about diffusion is that it involves the movement of particles from an area of higher concentration to an area of lower concentration.
3. Clarify the energy requirement: Diffusion is a passive process and does not require energy input. It occurs due to the natural kinetic energy of particles.
4. Consider the medium of diffusion: Diffusion can occur in gases, liquids, and solids, not just in liquids. It is a fundamental process in various states of matter.
5. Review the incorrect statements: The statement that diffusion requires energy input and occurs only in liquids are incorrect. Diffusion is a spontaneous process that can happen in any medium where particles are free to move.