Which one is true about nascent hydrogen?

Options

A. More reactive than molcular hydrogen
B. can be produced in situ
C. Show similarity exactly with hydrogen in reduction reactions
D. both 1 and 2

Answer

To determine which statements about nascent hydrogen are true, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Nascent Hydrogen**:
- Nascent hydrogen refers to hydrogen that is generated during a chemical reaction, particularly in its atomic form, rather than as diatomic molecules (H2). It is often considered to be more reactive than molecular hydrogen.

2. **Analyzing Statement A**:
- "Nascent hydrogen is more reactive than molecular hydrogen."
- This statement is **true**. Nascent hydrogen, being in atomic form, is indeed more reactive than molecular hydrogen (H2), which is relatively stable.

3. **Analyzing Statement B**:
- "Nascent hydrogen can be produced in situ."
- This statement is also **true**. Nascent hydrogen is produced during a chemical reaction, such as when a metal reacts with a dilute acid, making it an in situ product.

4. **Analyzing Statement C**:
- "Nascent hydrogen shows similarity exactly with hydrogen in reduction reactions."
- This statement is **false**. While nascent hydrogen can participate in reduction reactions, it is more reactive than molecular hydrogen and does not show exact similarity in behavior.

5. **Analyzing Statement D**:
- "Both 1 and 2."
- Since both statements A and B are true, this statement is also **true**.

### Conclusion:
Based on the analysis:
- The correct answer is **D: Both 1 and 2**.