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Supercritical ________ is used as a green solvent for decaffeination and dry cleaning.
- Water
- Ethanol
- CO₂
- Methane
Answer: CO₂
Supercritical CO₂ (above 31°C, 73 atm) has gas-like diffusivity and liquid-like solvation power. Non-toxic, non-flammable, easily separable. Embodies green chemistry principles. [[NCERT Chemistry Class 12]]