Carbon monoxide, a substance found in tobacco smoke, is also found in __________.

• A. distilled water
• B. baking soda
• C. automobile exhaust
• D. table salt

Answer: (C)

Verified step by step guidance

1. Understand the nature of carbon monoxide (CO): it is a colorless, odorless gas produced by the incomplete combustion of carbon-containing fuels.
2. Recall common sources of carbon monoxide: it is typically generated when fuels such as gasoline, wood, coal, or natural gas burn without enough oxygen.
3. Evaluate the options given: distilled water, baking soda, and table salt do not involve combustion processes and therefore do not produce carbon monoxide.
4. Recognize that automobile exhaust results from the combustion of gasoline in engines, which can produce carbon monoxide if the combustion is incomplete.
5. Conclude that among the options, automobile exhaust is the correct source where carbon monoxide is found.