Which of the following is least pollutant ?

Options

A. `NO_(x)`
B. `SO_(x)`
C. `CO_(2)`
D. `C_(x)H_(y)`

Answer

To determine which of the following options is the least pollutant, we will analyze each option provided in the question. The options are:

1. NOx (Nitrogen oxides)
2. Oxides of sulfur
3. Carbon dioxide (CO2)
4. Carbohydrates

### Step-by-Step Solution:

**Step 1: Analyze NOx (Nitrogen oxides)**
Nitrogen oxides are pollutants that can lead to the formation of smog and acid rain. They can react with water in the atmosphere to form nitric acid, which is harmful to both the environment and human health.

**Step 2: Analyze Oxides of Sulfur**
Oxides of sulfur, particularly sulfur dioxide (SO2), can also combine with water to form sulfuric acid. This is another significant contributor to acid rain and can have detrimental effects on ecosystems and human health.

**Step 3: Analyze Carbon Dioxide (CO2)**
Carbon dioxide is a natural component of the atmosphere and is essential for the process of photosynthesis in plants. While it is a greenhouse gas and contributes to climate change, it is not considered a pollutant in the same harmful sense as NOx and sulfur oxides. Plants utilize CO2 to produce glucose and oxygen, making it beneficial in that context.

**Step 4: Analyze Carbohydrates**
Carbohydrates are organic compounds that are not pollutants in the traditional sense. They are essential for life and are produced by plants during photosynthesis. However, they are not typically classified as pollutants.

**Step 5: Conclusion**
Among the options provided, carbon dioxide (CO2) is the least pollutant. It plays a crucial role in the ecosystem and is utilized by plants, making it less harmful compared to NOx and oxides of sulfur.

### Final Answer:
**Carbon dioxide (CO2) is the least pollutant among the given options.**

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