State whether the following statements are true or false :
b) Coal tar is a mixture of various substances.

Explanation

To determine whether the statement "Coal tar is a mixture of various substances" is true or false, we can analyze the composition of coal tar.

### Step-by-Step Solution:

1. **Understanding Coal Tar**:
- Coal tar is a by-product obtained from the destructive distillation of coal. This process involves heating coal in the absence of air, which breaks it down into various components.

2. **Composition of Coal Tar**:
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