Explain the following:
A piece of paper becomes black when concentrated sulphuric acid is poured on it. 

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Composition of Paper**:
- Paper is primarily made from cellulose, which is a polysaccharide. Cellulose is a type of carbohydrate that consists of long chains of glucose molecules.

2. **Action of Concentrated Sulfuric Acid**:
- When concentrated sulfuric acid (H₂SO₄) is poured onto paper, it reacts with the cellulose. Sulfuric acid is a strong dehydrating agent, meaning it has the ability to remove water (H₂O) from substances.

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