Question

Consider the following statements regarding diffusion:
A. Diffusion occurs due to concentration gradient
B. Diffusion coefficient increases with temperature
C. Diffusion is faster in solids than gases
D. Fick’s law applies to steady-state diffusion
E. Diffusion requires bulk motion
Choose the correct answer from the options given below:

• A. A, B, C only
• B. A, B, D only
• C. A, B, E only
• D. A, B, C, D only

Hint:

Diffusion = movement due to gradient, not bulk flow.

Answer 1

The Correct Option is B

Concept: Diffusion is a mass transfer process driven by concentration gradients and described by Fick’s law.

Step 1: Evaluating Statement A.
Diffusion:
• Occurs due to concentration gradient Correct.

Step 2: Evaluating Statement B.
Temperature:
• Increase in temperature increases molecular motion
• Enhances diffusion coefficient Correct.

Step 3: Evaluating Statement C.
Diffusion rate:
• Fastest in gases, slowest in solids Thus, incorrect.

Step 4: Evaluating Statement D.
Fick’s law:
• Applies to steady-state diffusion Correct.

Step 5: Evaluating Statement E.
Diffusion:
• Does not require bulk motion Thus, incorrect.

Step 6: Final selection. \[ A, B, D \] Final Conclusion:
Option (2) is correct.