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प्रश्न
What are ultrafilters?
अति संक्षिप्त उत्तर
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उत्तर
Ultrafilters are special filter papers made by treating ordinary filter paper with collodion or gelatin and hardening it with formaldehyde. They have reduced pore size to retain colloidal particles while allowing impurities to pass through, used in ultrafiltration.
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