When a small piece of dry sodium is put in water, it reacts vigorously to produce

Options

A. nitrogen gas
B. hydrogen gas
C. carbon dioxide gas
D. sulphur dioxide

Explanation

To solve the question "When a small piece of dry sodium is put in water, it reacts vigorously to produce," we need to understand the chemical reaction that occurs when sodium interacts with water.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant in this case is sodium (Na), which is a metal, and water (H₂O).

2. **Understand the Reaction**:
- When sodium is added to water, it reacts vigorously. Sodium is highly reactive, especially with water.

3. **Write the Chemical Equation**:
- The reaction can be represented by the chemical equation:
\[ 2 \text{Na} + 2 \text{H}_2\text{O} \rightarrow 2 \text{NaOH} + \text{H}_2 \]
- In this equation, sodium reacts with water to form sodium hydroxide (NaOH) and hydrogen gas (H₂).

4. **Identify the Products**:
- The products of the reaction are sodium hydroxide (NaOH) and hydrogen gas (H₂).

5. **Conclusion**:
- Therefore, when a small piece of dry sodium is put in water, it reacts vigorously to produce sodium hydroxide and hydrogen gas.

### Final Answer:
When a small piece of dry sodium is put in water, it reacts vigorously to produce sodium hydroxide (NaOH) and hydrogen gas (H₂).

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