Green chemistry in day-to-day life is in the use of :

Solution

Chemistry ma’am · 3 steps

Green chemistry swaps a harmful chemical for a safe one, and liquid CO₂ does that for dry cleaning.

1. What to look for. Green chemistry means getting the same job done with less harm: fewer toxic chemicals, less waste, less pollution. So look for the option where a hazardous substance has been replaced by a safer one.

   Option	What happens	Green?
   (a) Chlorine bleaching	Chlorine reacts with organic matter in pulp and forms toxic chlorinated compounds such as dioxins	No
   (b) Lots of water alone	Wastes a precious resource, and water alone does not remove greasy dirt	No
   (c) Tetrachloroethene	Cl₂C=CCl₂ is a chlorinated solvent that is a suspected carcinogen and pollutes groundwater	No
   (d) Liquefied CO₂	Non-toxic, does not burn, and is recovered and reused. With a suitable detergent it replaces the toxic solvent	Yes

2. Why CO2 works. Under pressure, CO₂ becomes a liquid that dissolves greasy stains when a suitable detergent is added. When the pressure is released it turns back into gas and leaves no harmful residue on the clothes.
3. So. The everyday use of green chemistry is (d), liquefied CO₂ for dry cleaning clothes.

The idea to keep. Pick the option that replaces a toxic or wasteful process with a safe, reusable one. Liquid CO₂ for dry cleaning and H₂O₂ for bleaching paper are the standard examples.

Answer from the NTA final answer key. Solution by PrepWiser.