_____________ is the most commonly used 'filter aid'?
Correct answer: D. Diatomaceous earth
- A. Semi-plastic clay
- B. Fuller's earth
- C. Vermiculite
- D. Diatomaceous earth
Explanation
Diatomaceous earth, also called kieselguhr, is the most commonly used filter aid because its porous, low-density particles form a highly permeable filtration cake. Fuller's earth and clay are more commonly used as adsorbents or clarifying materials.
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