Chemistry - Environmental Chemistry Question with Solution | TestHub

The question asks to identify an eco-friendly dry cleaning agent from the given options.

Option A: ${\mathrm{Cl}}_2\mathrm{C}={\mathrm{CCl}}_2$ (Tetrachloroethylene or Perc) is a common dry cleaning solvent but is a known pollutant and health hazard.

Option B: ${\mathrm{H}}_2{\mathrm{O}}_2$ (Hydrogen peroxide) is an oxidizing agent, often used as a bleach or disinfectant, not typically a primary dry cleaning solvent.

Option C: ${\mathrm{CO}}_2$ (liquid carbon dioxide) is an eco-friendly alternative for dry cleaning. It is non-toxic, non-flammable, and leaves no residue.

Option D: D.D.T. (Dichlorodiphenyltrichloroethane) is an insecticide, not a dry cleaning agent, and is highly toxic and persistent in the environment.

Therefore, liquid ${\mathrm{CO}}_2$ is the most eco-friendly dry cleaning agent among the choices.

The final answer is $\boxed{C}$.