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Which of the following is inorganic and organic in nature?

(a) Sewage Sludge

(b) Liquid crystalline

(c) Natural gas

(d) Semi crystalline

The question was posed to me in an internship interview.

This interesting question is from Enzymes Catalyzing Pesticide Degradation Reactions topic in division Biodegradation of Pesticides in the Environment of Environmental Biotechnology

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Correct choice is (a) Sewage Sludge

To elaborate: Sewage Sludge is produced during primary and secondary treatment phases and are usually sticky and has pathogens, so, it is both inorganic and organic, whereas, Liquid crystalline and Semi crystalline are optically active polymer that can activate in response to heat, light, electrical field etc. and hence, is not is inorganic or organic and natural gas is usually a hydrocarbon which is non-renewable.

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