Consider the following:
1. Hydrofluorocarbons
2. Hydrochlorofluorocarbons (HCFCs)
3. Ammonia
4. Hydrogen
Which among the above are generally used in the Absorption refrigerators, used in warehouses?

Answer: [C] 3 & 4

Compressor refrigerators typically use an HCFC or HFC, while absorption refrigerators typically use ammonia or Ammonia & Hydrogen.

This question is a part of GKToday's Integrated IAS General Studies Module