Freons are not recommended to be used in refrigerators because they cause

Options

A. global warming
B. acid rain
C. depletion of ozone layer
D. very less cooling

Answer

### Step-by-Step Solution:

1. **Understanding Freons**: Freons are a group of chemicals known as chlorofluorocarbons (CFCs). The most common type of Freon used in refrigerators is dichlorodifluoromethane, with the chemical formula CF2Cl2.

2. **Impact on Ozone Layer**: Freons are not recommended for use in refrigerators primarily because they contribute to the depletion of the ozone layer. This is a significant environmental concern.

3. **Mechanism of Ozone Depletion**:
- When Freons are released into the atmosphere, they eventually reach the stratosphere, where they are broken down by ultraviolet (UV) radiation from the sun.
- This breakdown process releases chlorine atoms (Cl) as free radicals. For example:
- CF2Cl2 → CF2Cl + Cl (after exposure to UV light)

4. **Reaction with Ozone**: The chlorine free radicals react with ozone (O3) molecules in the atmosphere:
- Cl + O3 → ClO + O2
- This reaction depletes ozone, converting it into oxygen (O2) and forming chlorine monoxide (ClO).

5. **Regeneration of Chlorine Radicals**: The chlorine monoxide can further react with nascent oxygen (O) to regenerate the chlorine radical:
- ClO + O → Cl + O2
- The chlorine radical is free to react with more ozone, continuing the cycle of ozone depletion.

6. **Conclusion**: The continuous release of chlorine radicals from Freons leads to significant depletion of the ozone layer, which protects the Earth from harmful UV radiation. Therefore, Freons are not recommended for use in refrigerators.

### Final Answer:
Freons are not recommended for use in refrigerators because they cause depletion in the ozone layer.

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