Question

Which of the following are the colloidal materials present in domestic sewage?

• A. Calcium
• B. Sand
• C. Ammonia
• D. Fecal matter

Answer 1

Answer:

D. Fecal matter

• The substances that do not readily dissolve in water but also are not settled down are known as colloidal substances.

• They may be filtered out in a Gooch Crucible and contains fecal matter, bacteria, cloth, and paper fibers.