Which of the following statement is correct ?

Options

A. Ozone hole is a hole formed in stratosphere from which ozone oozes out.
B. Ozone hole is a hole formed in the troposphere from which ozone oozes out.
C. Ozone hole is thinning of ozone layer of stratosphere at some places.
D. Ozone hole means vanishing of ozone layer around the earth completely.

Answer

To determine which statement about the ozone hole is correct, we will analyze the information provided in the video transcript step by step.

### Step 1: Identify the Compounds Responsible for Ozone Depletion
The video mentions that the ozone hole is primarily formed due to two types of compounds: nitrogen oxides and chlorofluorocarbons (CFCs). These compounds are known to contribute significantly to the depletion of the ozone layer.

### Step 2: Understand the Reaction Mechanism
The transcript explains the chemical reactions involved in ozone depletion:
- Nitrogen dioxide (NO2) reacts with ozone (O3) to produce nitrogen dioxide and oxygen.
- Chlorofluorocarbons (like CF2Cl2) release chlorine radicals when they break down, which then react with ozone.
- The chlorine radicals continue to deplete ozone in a cyclic manner, leading to further ozone loss.

### Step 3: Recognize the Location of the Ozone Layer
The ozone layer is located in the stratosphere, which extends from about 10 to 50 kilometers above sea level. The video emphasizes that the reactions causing ozone depletion occur in this layer.

### Step 4: Evaluate the Statements
Based on the information provided, we need to evaluate the statements given in the question. The correct statement must accurately reflect the nature of the ozone hole and its formation.

### Step 5: Identify the Correct Statement
According to the video, the correct statement is:
- "Ozone hole is thinning of ozone layer of stratosphere at some places."

### Conclusion
The correct answer is option 3, as it accurately describes the phenomenon of the ozone hole.

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