The device on an automobile that filters harmful pollutants out of the exhaust before it enters the air is a[n).

Options

A. radiator
B. catalytic converter
C. carburetor
D. alternator

Answer

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks for the device in an automobile that filters harmful pollutants from the exhaust before they are released into the atmosphere.

2. **Understand the Function of the Device:** The device in question is designed to reduce the emission of harmful gases produced by the engine, thereby improving air quality.

3. **Consider Common Devices in Automobiles:** Some common devices found in automobiles include the radiator, carburetor, alternator, and catalytic converter.

4. **Evaluate Each Device:**
- **Radiator:** This device is primarily used for cooling the engine and does not filter exhaust gases.
- **Carburetor:** This device mixes air with fuel for combustion but does not filter pollutants from exhaust.
- **Alternator:** This device generates electricity for the vehicle and does not have a role in filtering exhaust gases.
- **Catalytic Converter:** This device is specifically designed to convert harmful gases like carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful emissions before they exit the exhaust system.

5. **Conclude the Answer:** Based on the evaluation, the correct answer is the **catalytic converter**, as it is the only device among the options that filters harmful pollutants from the exhaust.

**Final Answer:** The device on an automobile that filters harmful pollutants out of the exhaust before it enters the air is a **catalytic converter**.

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