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Which of the following is both inorganic and organic?

(a) Sewage Sludge

(b) Liquid crystalline

(c) Natural gas

(d) Semi crystalline

I got this question in quiz.

The above asked question is from Basic Aspects of Solid Waste Management topic in chapter Biotechnology for Solid Waste Management of Environmental Biotechnology

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Correct choice is (a) Sewage Sludge

For explanation: 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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