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Which of the following practices involve...

Which of the following practices involve green chemistry ?
(i) Substitute CFCs by environmental friendly HFCs and other compounds
(ii) Replace halogenated solvent by liquid `CO_(2)` for drycleaning ,
(iii) Use of `H_(2)O_(2)` for bleaching instead of `Cl_(2)`
(iv) Use of tamarind seeds to clean municipal and industrial waste water.

A

(i) and (ii) only

B

(ii) and (iv) only

C

(iii) and (iv) only

D

(i),(ii),(iii)and (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the practices involve green chemistry, we need to analyze each statement provided in the question: 1. **Substitute CFCs by environmentally friendly HFCs and other compounds**: - CFCs (chlorofluorocarbons) are known to deplete the ozone layer, which protects us from harmful UV radiation. Replacing CFCs with HFCs (hydrofluorocarbons) is a practice that aligns with green chemistry principles as it aims to reduce environmental harm. HFCs have a lower ozone depletion potential (ODP) compared to CFCs. - **Conclusion**: This practice is related to green chemistry. 2. **Replace halogenated solvent by liquid CO₂ for dry cleaning**: - Traditional dry cleaning methods often use halogenated solvents, which can be harmful to the environment. Liquid CO₂ is a non-toxic alternative that can effectively clean clothes without the negative environmental impact associated with halogenated solvents. Although it may require special equipment and can be more expensive, it is a greener option. - **Conclusion**: This practice is related to green chemistry. 3. **Use of H₂O₂ for bleaching instead of Cl₂**: - Hydrogen peroxide (H₂O₂) is a strong oxidizing agent and is used as a bleaching agent. It is preferred over chlorine (Cl₂) because it is less harmful to the environment and does not produce toxic by-products. Using H₂O₂ aligns with the principles of green chemistry by minimizing hazardous substances. - **Conclusion**: This practice is related to green chemistry. 4. **Use of tamarind seeds to clean municipal and industrial wastewater**: - Tamarind seeds can be used as a natural coagulant for treating wastewater. This method is environmentally friendly as it utilizes a natural resource to help in the coagulation and flocculation processes, making it a sustainable practice for wastewater treatment. - **Conclusion**: This practice is related to green chemistry. **Final Answer**: All the practices mentioned (i, ii, iii, and iv) involve green chemistry.
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