The sulphide of Na can be prepared by the following reactions

Options

A. `2Na+S to Na_(2)S`
B. `Na_(2)OSO_(4)+4C to Na_(2)S+4CO`
C. `Na_(2)O_(2)+SO_(2) to Na_(2)S+2O_(2)`
D. `Na_(2)O+S to Na_(2)S+(1)/(2)O_(2)`

Answer

To determine the preparation of sodium sulfide (Na2S), we will analyze the given reactions step by step.

### Step 1: Understanding the Composition of Sodium Sulfide
Sodium sulfide consists of sodium ions (Na⁺) and sulfide ions (S²⁻). The formula Na2S indicates that two sodium ions combine with one sulfide ion.

**Hint:** Remember the charge balance when forming ionic compounds. Sodium (Na) has a +1 charge, while sulfide (S) has a -2 charge.

### Step 2: Analyzing Reaction A
**Reaction A:**
\[ \text{2Na} + \text{S} \rightarrow \text{Na}_2\text{S} \]

In this reaction, sodium (Na) reacts with sulfur (S) to form sodium sulfide (Na2S). Here, sodium is oxidized (from 0 to +1 oxidation state) and sulfur is reduced (from 0 to -2 oxidation state).

**Hint:** Identify oxidation and reduction processes to understand how the reactants transform into products.

### Step 3: Analyzing Reaction B
**Reaction B:**
\[ \text{Na}_2\text{SO}_4 + 4\text{C} \rightarrow \text{Na}_2\text{S} + 4\text{CO} \]

In this reaction, sodium sulfate (Na2SO4) is reduced using carbon (C) to produce sodium sulfide (Na2S) and carbon monoxide (CO). This is a carbothermic reduction process.

**Hint:** Look for reactions where a compound is reduced by carbon; these often yield sulfides from sulfates.

### Step 4: Analyzing Reaction C
**Reaction C:**
\[ \text{Na}_2\text{O}_2 + \text{SO}_2 \rightarrow \text{Na}_2\text{S} + \text{O}_2 \]

In this reaction, sodium peroxide (Na2O2) reacts with sulfur dioxide (SO2) to produce sodium sulfide (Na2S) and oxygen (O2). This reaction also produces sodium sulfide.

**Hint:** Consider how different oxides and sulfides can interact to form new compounds.

### Step 5: Analyzing Reaction D
**Reaction D:**
\[ \text{Na}_2\text{O} + \text{S} \rightarrow \text{Na}_2\text{S} + \frac{1}{2}\text{O}_2 \]

In this reaction, sodium oxide (Na2O) reacts with sulfur (S) to form sodium sulfide (Na2S) and oxygen (O2). This is another method of producing sodium sulfide.

**Hint:** Look for reactions involving oxides and their reduction or combination with sulfur.

### Conclusion
From the analysis of the four reactions:
- **Reactions A, B, C, and D** all lead to the formation of sodium sulfide (Na2S). Therefore, sodium sulfide can be prepared by all these reactions.

**Final Answer:** Sodium sulfide can be prepared by reactions A, B, C, and D.