Conc. `H_(2)SO_(4)` chars paper, wood and sugar because it removes...............from them.

Explanation

To solve the question, we need to understand the properties of concentrated sulfuric acid (H₂SO₄) and its interaction with materials like paper, wood, and sugar.

### Step-by-Step Solution:

1. **Identify the Nature of Concentrated H₂SO₄**:
- Concentrated sulfuric acid is known to be a strong dehydrating agent. This means it has the ability to remove water (H₂O) from substances.

2. **Understanding the Composition of Paper, Wood, and Sugar**:
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