Which of the following is generated from coal? (Mercury, Uranium, Thorium, All) .

Explanation

To solve the question "Which of the following is generated from coal? (Mercury, Uranium, Thorium, All)", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which substances are generated from coal when it is burned or processed.

2. **Analyze Each Option**:
- **Mercury**: When coal is burned, it can release mercury into the environment. This is due to the presence of trace amounts of mercury in coal.
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