Which of the following gas was traditionally used to bleach paper?

At each trophic level, the pollutant gets 10 times more concentrated.

Identify the type of waste which can be degraded by composting, vermicomposting and landfills method.

Plants always take in carbon dioxide and release oxygen.

Which of the following is not a constituent of DDT?

Replacement of liquid CO2 by halogenated solvent will result in less harm to groundwater.

Which among the following is a biodegradable waste?

What is the full form of PCB(in the context of chemistry)?