Which of the following is not used as filter aid ?
Correct answer: D. Rice husk
- A. Asbestos
- B. Diatomaceous earth
- C. Purified wood cellulose
- D. Rice husk
Explanation
Common filter aids include diatomaceous earth, asbestos, and purified cellulose because they form a permeable porous cake. Rice husk is not a standard filter aid in this conventional classification.
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