Question

Diatomaceous earth is used for all except
A. polishing
B. filtration of offs and syrups
C. making sound and fire proof rooms
D. biogas production

Answer 1

Hint: Diatomite is utilized in purification of oil, syrups, sugar, alcohols and antibiotics, Diatomaceous earth is utilized to make sound proof rooms. Diatomite serves as a cleaning agent in toothpastes and metal polishes.

Complete answer:
- Diatomaceous earth is a naturally occurring, soft, siliceous sedimentary rock that is crumbled into a fine white to off-white powder. It is composed of fossilized remains of diatoms.
- It is utilized in a purification of aid, mild abrasive products like mechanical insecticide, matting agent for coatings, reinforcing filler in plastics and rubber, anti-block in plastic films, porous support for chemical catalysts, cat litter, metal polishes and toothpaste etc.

Now, let us find the solution from the option.
- The diatom’s cell walls are impacted with silica and so the walls are unbreakable. So, diatoms have remained besides a huge number of cell deposits in their environment; this aggregation over millions of years is known as 'diatomaceous earth'.
- Being sandy this soil is utilized in polishing, purification of oils and syrups but not used in biogas production.

Thus, the correct option is D. i.e. biogas production.

Note: Every layer of diatomaceous earth is unique, with a variety of blends of pure diatomaceous earth together with different clays and minerals. The diatoms in every deposit consists of different quantities of silica, relying on the lifespan of the deposit. The individuals of diatom may also vary between deposits.