Carbon monoxide is harmful to human beings as it is

Options

A. is carcinogenic
B. is antagonistic to `CO_(2)`
C. has higher affinity for haemoglobin as compared to oxygen
D. is destructive to `CO_(2)`

Explanation

To answer the question "Carbon monoxide is harmful to human beings as it is," we will analyze the options provided and determine which one accurately describes the harmful nature of carbon monoxide.

### Step-by-Step Solution:

1. **Understanding Carbon Monoxide (CO)**:
- Carbon monoxide is a colorless, odorless gas that can be produced from incomplete combustion of carbon-containing fuels.

2. **Analyzing the Options**:
- **Option A: Carcinogenic**:
- Carcinogenic substances are those that can cause cancer. Carbon monoxide is not classified as a carcinogen. Therefore, this option is incorrect.

- **Option B: Antagonistic to CO2**:
- Antagonistic means opposing or counteracting. Carbon monoxide does not oppose carbon dioxide; instead, it competes with oxygen for binding sites on hemoglobin. Thus, this option is also incorrect.

- **Option C: Higher affinity for hemoglobin compared to oxygen**:
- This statement is true. Carbon monoxide has a much higher affinity for hemoglobin than oxygen does. When inhaled, CO binds to hemoglobin, forming carboxyhemoglobin, which prevents hemoglobin from carrying oxygen. This can lead to suffocation and can be fatal. Therefore, this option is correct.

- **Option D: Destructive to CO2**:
- This option does not accurately describe the effects of carbon monoxide. It does not destroy carbon dioxide. Thus, this option is incorrect.

3. **Conclusion**:
- The correct answer is **Option C**: Carbon monoxide is harmful to human beings as it has a higher affinity for hemoglobin compared to oxygen, leading to reduced oxygen transport in the body and potential suffocation.

### Final Answer:
Carbon monoxide is harmful to human beings as it has a higher affinity for hemoglobin compared to oxygen.

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