Which is a sources of nascent hydrogen?
(i) Zn + dil HCl
ii `CH_(3)OH + Na`
(iii) Electrolysis of `H_(2)O`
(iv) Silent electric discharge of `H_(2)O_(2)`

Options

A. I & II
B. II & III
C. I, II, III
D. IV

Answer

To determine the sources of nascent hydrogen from the given options, we need to analyze each reaction step by step.

### Step 1: Analyze the first option - Zn + dilute HCl
- **Reaction**: When zinc (Zn) reacts with dilute hydrochloric acid (HCl), the reaction can be written as:
\[ \text{Zn} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \]
- **Nascent Hydrogen**: In this reaction, zinc displaces hydrogen from hydrochloric acid, resulting in the formation of nascent hydrogen (H) as a product. Thus, this option produces nascent hydrogen.

### Step 2: Analyze the second option - CH₃OH + Na
- **Reaction**: When methanol (CH₃OH) reacts with sodium (Na), the reaction can be represented as:
\[ \text{CH}_3\text{OH} + \text{Na} \rightarrow \text{CH}_3\text{ONa} + \text{H} \]
- **Nascent Hydrogen**: Here, sodium reacts with methanol to produce sodium methoxide and nascent hydrogen. Therefore, this option also produces nascent hydrogen.

### Step 3: Analyze the third option - Electrolysis of H₂O
- **Reaction**: Electrolysis of water (H₂O) can be represented as:
\[ 2 \text{H}_2\text{O} \rightarrow 2 \text{H}_2 + \text{O}_2 \]
- **Nascent Hydrogen**: In this process, hydrogen gas (H₂) is produced, not nascent hydrogen. Therefore, this option does not produce nascent hydrogen.

### Step 4: Analyze the fourth option - Silent electric discharge of H₂O₂
- **Reaction**: The decomposition of hydrogen peroxide (H₂O₂) under silent electric discharge can be represented as:
\[ 2 \text{H}_2\text{O}_2 \rightarrow 2 \text{H}_2\text{O} + \text{O}_2 \]
- **Nascent Hydrogen**: In this reaction, water and oxygen are produced, but not nascent hydrogen. Thus, this option does not produce nascent hydrogen.

### Conclusion
From the analysis:
- The first option (Zn + dilute HCl) produces nascent hydrogen.
- The second option (CH₃OH + Na) also produces nascent hydrogen.
- The third option (Electrolysis of H₂O) does not produce nascent hydrogen.
- The fourth option (Silent electric discharge of H₂O₂) does not produce nascent hydrogen.

**Correct Options**: (i) and (ii) are sources of nascent hydrogen.