Which pollutant causes the following effects?
1. Causes dryness to throat
2. Causes damage to neuron
3. Causes headache, blurred vision

Options

A. Hydrocarbons
B. Hydrogen sulphide
C. Hydrogen flouride
D. Hydrogen cyanide.

Answer

To solve the question regarding which pollutant causes the specified effects, we can analyze each effect and match it with the appropriate pollutant.

### Step-by-Step Solution:

1. **Identify the Effects**: The question lists three specific effects:
- Causes dryness to throat
- Causes damage to neurons
- Causes headache and blurred vision

2. **Analyze Each Pollutant**:
- **Hydrocarbons**: These are organic compounds primarily made of hydrogen and carbon. They can contribute to air pollution but are not specifically known for causing the listed effects.
- **Hydrogen Sulfide**: This gas has a characteristic smell of rotten eggs and can cause irritation to the eyes and respiratory system, but it is not primarily associated with neuron damage or causing headaches and blurred vision.
- **Hydrogen Fluoride**: This compound can cause irritation to the throat and respiratory tract but is not typically linked to neuron damage or headaches.
- **Hydrogen Cyanide**: This is a highly toxic compound that can interfere with oxygen transport in the body. It is known to cause various symptoms, including headache, confusion, nausea, and can lead to damage to neurons.

3. **Match Effects to Pollutants**:
- **Dryness to Throat**: Hydrogen cyanide can cause irritation in the respiratory tract.
- **Damage to Neurons**: Hydrogen cyanide is known to be neurotoxic and can cause damage to neurons.
- **Headache and Blurred Vision**: Hydrogen cyanide can lead to headaches and confusion, which may include blurred vision as a symptom.

4. **Conclusion**: Based on the analysis, the pollutant that causes all the listed effects is **Hydrogen Cyanide**.

### Final Answer:
The pollutant that causes the effects of dryness to the throat, damage to neurons, and headache with blurred vision is **Hydrogen Cyanide**.

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