Which of the following statements are correct ?
(i) Catalytic converters convert unburnt hydrocarbons into `CO_(2)` and `H_(2)O` .
(ii) The catalytic converter converts carbon monoxide and nitric oxide into `CO_(2)` and `N_(2)` .
(iii) Automobiles are the major cause of atmospheric pollution in the world.
(iv) Proper maintenance of automobiles along with the use of lead-free petrol or diesel cannot reduce the pollutants they emit.
(v) In India, the Air (Prevention and Control of Pollution) Act came into force in 1981 amended in 1987 to include noise as air pollutants.

Options

A. (i), (ii), (iv) and (v)
B. (i), (ii), (iii) and (v)
C. (iii), (iv) and (v)
D. (i), (ii) and (iii)

Answer

To determine which statements are correct regarding catalytic converters and air pollution, let's analyze each statement step by step.

1. **Statement (i)**: Catalytic converters convert unburnt hydrocarbons into CO₂ and H₂O.
- **Analysis**: This statement is correct. Catalytic converters are designed to facilitate chemical reactions that convert unburnt hydrocarbons (which are harmful pollutants) into carbon dioxide (CO₂) and water (H₂O), thus reducing emissions.

2. **Statement (ii)**: The catalytic converter converts carbon monoxide and nitric oxide into CO₂ and N₂.
- **Analysis**: This statement is also correct. Catalytic converters help in converting carbon monoxide (CO), a toxic gas, and nitric oxide (NO), a contributor to smog, into carbon dioxide (CO₂) and nitrogen gas (N₂), which are less harmful.

3. **Statement (iii)**: Automobiles are the major cause of atmospheric pollution in the world.
- **Analysis**: This statement is correct. Automobiles are indeed one of the major contributors to atmospheric pollution, especially in urban areas, due to the emissions of various pollutants.

4. **Statement (iv)**: Proper maintenance of automobiles along with the use of lead-free petrol or diesel cannot reduce the pollutants they emit.
- **Analysis**: This statement is incorrect. Proper maintenance and the use of lead-free fuels can significantly reduce the emissions from automobiles. Therefore, this statement does not hold true.

5. **Statement (v)**: In India, the Air (Prevention and Control of Pollution) Act came into force in 1981 amended in 1987 to include noise as air pollutants.
- **Analysis**: This statement is correct. The Air (Prevention and Control of Pollution) Act was indeed enacted in 1981, and it was amended in 1987 to include noise pollution as a concern, recognizing its impact on health and well-being.

**Conclusion**: The correct statements are (i), (ii), (iii), and (v). The incorrect statement is (iv).

### Final Answer:
The correct statements are: (i), (ii), (iii), and (v).

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