Which of the following are being proposed as a viable alternative to Hydro Fluoro Carbons HFCs used ...........

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Which of the following are being proposed as a viable alternative to Hydro Fluoro Carbons (HFCs) used in the refrigerant industry?

1. Hydro Fluoro Olefins (HFOs)

2. Hydrocarbon based refrigerants

3. Carbon Dioxide

4. Water

5. Sand

Select the correct answer using the codes given below

1,2 and 3 only

1,2, 3 and 4 only

2,3,4 and 5 only

All of the above

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Explanation:

Apart from the four options given above, Ammonia is also a viable alternative.
These all except for Sand are being proposed as viable alternatives to HFCs.
Each one has its own issue though that is preventing their widespread adoption. For example- Ammonia is poisonous, Hydrocarbon based coolants are flammable.