State True or false :
concentrated `H_(2)SO_(4)` can not be used for drying `H_(2)`?

Answer

To determine whether the statement "concentrated H₂SO₄ cannot be used for drying H₂" is true or false, we can analyze the properties of concentrated sulfuric acid and its interaction with hydrogen gas.

### Step-by-Step Solution:

1. **Understanding Drying Agents**:
- Drying agents are substances that absorb moisture from gases or liquids. Concentrated sulfuric acid (H₂SO₄) is commonly used as a drying agent due to its strong hygroscopic nature.

2. **Properties of Concentrated H₂SO₄**:
- Concentrated H₂SO₄ is a strong dehydrating agent. It can absorb water vapor from the air and other substances.

3. **Reaction with Hydrogen**:
- Hydrogen gas (H₂) is flammable. When concentrated H₂SO₄ is used to dry gases, it can produce a significant amount of heat due to its exothermic reaction with water.

4. **Flammability of Hydrogen**:
- The heat generated from the reaction of concentrated H₂SO₄ with moisture can ignite hydrogen gas, leading to a fire or explosion.

5. **Conclusion**:
- Due to the risk of fire and the flammability of hydrogen, concentrated H₂SO₄ is not suitable for drying hydrogen gas. Therefore, the statement "concentrated H₂SO₄ cannot be used for drying H₂" is **True**.

### Final Answer:
**True**