Which practice is most aligned with green chemistry in laboratory work?

• A. Using nonrenewable energy sources without consideration
• B. Releases more waste than the traditional method
• C. Requires high-pressure, high-temperature conditions for all reactions
• D. Recycling reagents and solvents

Answer: (D)

Green chemistry aims to minimize waste and conserve resources in lab work. Recycling reagents and solvents fits this aim because it reduces the amount of chemical waste generated, lowers the overall consumption of materials, and can cut costs and exposure hazards. It keeps useful chemicals in circulation instead of discarding them, which is exactly the kind of efficient, sustainable practice green chemistry promotes.

By contrast, using nonrenewable energy sources without consideration adds to environmental impact; releasing more waste than a traditional method increases pollution; and high-pressure, high-temperature conditions for all reactions tend to waste energy and can raise hazards, which is not inherently aligned with greener practices unless carefully justified and optimized.