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Chlorofluorocarbons (CFCs) are widely used in air conditioners, refrigerators etc, because of being:

1. highly reactive
2. flammable
3. non-reactive
4. all of these

Correct answer: non-reactive

Solution

CFCs are used in cooling systems because they are chemically inert under normal conditions, so they do not readily react with the components of the appliance or the refrigerant cycle. Their non-reactivity makes them suitable for long-term use in sealed systems.

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