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Coal tar contains about...

Coal tar contains about

A

300 substances

B

400 substnaces

C

200 substances

D

100 substances

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Coal Tar**: - Coal tar is a thick, black liquid that is a byproduct of the destructive distillation of coal. This process involves heating coal in the absence of air, which breaks it down into various components. 2. **Destructive Distillation Process**: - When coal is heated to high temperatures (around 1000 degrees Celsius) without air, it undergoes thermal decomposition. This process produces several products, including coal gas, coal tar, and coke. 3. **Composition of Coal Tar**: - Coal tar is known to contain a complex mixture of organic compounds. It is estimated that coal tar consists of approximately 200 different substances. These substances include various hydrocarbons, phenols, and heterocyclic compounds. 4. **Examples of Substances in Coal Tar**: - Among the many substances found in coal tar, one notable example is bitumen. Bitumen is a viscous mixture that is often used in road construction and roofing. 5. **Conclusion**: - Therefore, the answer to the question "Coal tar contains about" is that coal tar contains about 200 different substances. ---
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