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In the context of which one of the following are the terms ‘pyrolysis and plasma gasification’ mentioned? [UPSC CSP 2019]

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1. In the context of which one of the following are the terms ‘pyrolysis and plasma gasification’ mentioned? **[UPSC CSP 2019]**

Extraction of rare earth elements

Natural gas extraction technologies

Hydrogen fuel-based automobiles

Waste-to-energy technologies

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