Test (Q). A compound 'X' was fused with Na metal and the extract gave a white precipitate with `AgNO_(3)`. The Lassaigne's extract gave red colouration with neutral `FeCl_(3)`. Test R while compound 'Y' when fused with Na metal and subsequent analysis on its Lassaigne's extract did not give any characteristic test. Test S while compound Y on fusion with fusion mixture (sodium carbonate+potassium nitrate) or `Na_(2)O_(2)`, followed by extraction, followed by addition of conc. `HNO_(3)` and ammonium molybdate gave a yellow precipitate
Q. Compound X

Options

A. will contain halogens
B. may contain halogens
C. may contain only sulphur
D. will contain nitrogen

Answer

### Step-by-Step Solution:

1. **Understanding the Problem**: We have a compound 'X' that was fused with sodium metal, and the resulting extract gave a white precipitate with AgNO3 and a red coloration with neutral FeCl3. We need to determine the composition of compound 'X'.

2. **Analyzing the White Precipitate with AgNO3**:
- The formation of a white precipitate when the extract is treated with AgNO3 indicates the presence of halogens, specifically chlorine (Cl).
- The reaction can be represented as:
\[ \text{NaCl} + \text{AgNO}_3 \rightarrow \text{AgCl (white precipitate)} + \text{NaNO}_3 \]
- This confirms that compound 'X' contains chlorine.

3. **Analyzing the Red Coloration with Neutral FeCl3**:
- The red coloration with neutral FeCl3 indicates the presence of thiocyanate ions (SCN^-), which suggests that sulfur (S) and nitrogen (N) are also present in compound 'X'.
- The reaction can be represented as:
\[ \text{NaSCN} + \text{FeCl}_3 \rightarrow \text{Fe(SCN)}^{3+} + \text{NaCl} \]
- The Fe(SCN)^{3+} complex gives a red coloration, confirming the presence of both sulfur and nitrogen in compound 'X'.

4. **Conclusion about Compound 'X'**:
- From the tests, we conclude that compound 'X' contains chlorine (a halogen), sulfur, and nitrogen.

5. **Evaluating the Options**:
- **Will contain halogens**: This is correct, as we confirmed the presence of chlorine.
- **May contain halogens**: This is incorrect, as we have definitive evidence of halogen presence.
- **May contain only sulfur**: This is incorrect, as we have confirmed the presence of chlorine and nitrogen as well.
- **Will contain nitrogen**: This is correct, as we confirmed the presence of nitrogen.

### Final Answer:
- Compound 'X' will contain halogens and nitrogen.