Diatomaceous earth is used for all except

polishing

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filtration of offs and syrups

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making sound and fire proof rooms

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biogas production

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Solution

The correct option is D biogas production
The cell walls of diatoms are embedded with silica and thus the walls are indestructible. Thus, diatoms have left behind a large number of cell deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'. Being gritty this soil is used in polishing, filtration of oils and syrups.
So the correct option is "biogas production".

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