Question

A suspension is formed from uniform particles of solid, of diameter 10 Mm, suspended in a solvent. What is the best description of this system?

• A. Monodisperse and coarse
• B. Monodisperse and colloidal
• C. Polydisperse and coarse
• D. Polydisperse and colloidal

Answer 1

The Correct Option is A

Step 1: Understanding dispersion and classification. - Monodisperse systems contain particles of uniform size. - Polydisperse systems contain particles of varying sizes. - Coarse dispersions have particle sizes larger than 1 μm. - Colloidal dispersions contain particles between 1 nm and 1 μm. 

Step 2: Analyzing the given system. - Given particle diameter = 10 Mm (10 μm). - 10 μm is larger than 1 μm, indicating a coarse dispersion. - The term uniform particles suggests a monodisperse system. 

Step 3: Explanation of incorrect options. - (B) Monodisperse and colloidal: Incorrect, as 10 μm is too large for a colloidal system. - (C) Polydisperse and coarse: Incorrect, as the system is described as having uniform particles. - (D) Polydisperse and colloidal: Incorrect for both polydispersity and colloidal range. 

Step 4: Selecting the correct option. Since the system is monodisperse and in the coarse range, the correct answer is (A) Monodisperse and coarse.